Carbon Dioxide Gauges | McMaster-Carr

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About Pressure Gauges

About Pipe Size

About Gas Regulators

Dual Scale With Center Back Connection

Bottom Connection

Center Back Connection

These are the most commonly used pressure gauges. Use them with pumps, filters, regulators, and in process lines to measure and display pressure.

Gauges with 304 stainless steel case or ABS plastic case have better corrosion resistance than gauges with brass or steel case.

For technical drawings and 3-D models, click on a part number.

ABS Plastic Case with Brass Connection—Dual Scale (psi, kPa)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±2% Mid Scale (Grade B)
Mount with the dial face upright

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kPa	psi	kPa	psi	kPa
0 to 30	0 to 200	1	5	5	50
0 to 60	0 to 400	2	10	10	100
0 to 100	0 to 700	2	20	20	100
0 to 160	0 to 1,100	5	20	20	200
0 to 200	0 to 1,400	5	50	40	200
0 to 300	0 to 2,000	10	50	50	500
0 to 600	0 to 4,000	20	100	100	1,000
0 to 1,000	0 to 7,000	20	200	200	1,000

						Bottom Connection		Center Back Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Mounting Orientation		Each		Each
BSPT Male
1 5/8"	1/8	-40° to 120°	-40° to 120°	Black	Upright	0000000	000000	0000000	000000
2"	1/4	-40° to 120°	-40° to 120°	Black	Upright	0000000	00000	0000000	00000
2 1/2"	1/4	-40° to 120°	-40° to 120°	Black	Upright	0000000	00000	0000000	00000

Square Panel-Mount Pressure Gauges

Center Back Connection (Panel Mount)

These gauges fit into square cutouts in your instrument panel. Use them with pumps, filters, regulators, and in process lines to measure and display pressure.

For technical drawings and 3-D models, click on a part number.

ABS Plastic Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±2.5% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 15	0.5	1
0 to 30	1	5
0 to 60	2	10
0 to 100	1	10
0 to 160	5	20
0 to 200	2	20
0 to 300	10	50

					Center Back Connection (Panel Mount)
Dial					For Panel Cutout
Ht.	Wd.	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Ht.	Wd.		Each
1/8 NPT Male/10-32 UNF Female
2"	2"	0° to 140°	0° to 140°	Black	1 49/64"	1 49/64"	0000000	000000

High-Accuracy Low-Pressure Gauges

Single Scale With Bottom Connection

Single Scale With Center Back Connection

Bottom Connection

Center Back Connection

Measure small pressure changes in ventilation systems, hydraulic applications, and other critical processes with these high-accuracy gauges. Mount them with the dial face upright.

Gauges with 304 stainless steel case or polyester plastic case have better corrosion resistance than gauges with steel case.

For technical drawings and 3-D models, click on a part number.

Painted Steel Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1.5% Full Scale (Not Graded)

Available Pressure Gauges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 3	0.05	0.5
0 to 5	0.1	1
0 to 10	0.2	2

						Bottom Connection		Center Back Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Mounting Orientation		Each		Each
NPT Male
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Upright	0000000	000000	0000000	000000
NPT Male with Calibration Certificate Traceable to NIST
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Upright	0000000	000000	0000000	000000

Painted Steel Case with Brass Connection—Single Scale (in. of H₂O)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1.5% Full Scale (Not Graded)

Available Pressure Gauges
Pressure Range, in. of H₂O	Graduation Marks, in. of H₂O	Numeric Increments, in. of H₂O
0 to 10	0.2	2
0 to 15	0.2	3
0 to 30	0.5	5
0 to 60	1	10
0 to 100	2	20
0 to 160	4	40
0 to 200	4	40

						Bottom Connection		Center Back Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Mounting Orientation		Each		Each
NPT Male
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Upright	0000000	000000	0000000	000000
NPT Male with Calibration Certificate Traceable to NIST
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Upright	0000000	000000	0000000	000000

Painted Steel Case with Brass Connection—Single Scale (oz./in.²)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1.5% Full Scale (Not Graded)

Available Pressure Gauges
Pressure Range, oz./in.²	Graduation Marks, oz./in.²	Numeric Increments, oz./in.²
0 to 10	0.2	2
0 to 15	0.2	3
0 to 30	0.5	5
0 to 60	1	10
0 to 100	2	20
0 to 160	4	40

						Bottom Connection		Center Back Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Mounting Orientation		Each		Each
NPT Male
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Upright	0000000	000000	0000000	000000
NPT Male with Calibration Certificate Traceable to NIST
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Upright	0000000	000000	0000000	000000

304 Stainless Steel Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Gauges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 3	0.05	0.5
0 to 5	0.1	1
0 to 10	0.2	2

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Mounting Orientation		Each
NPT Male
4"	1/4	0° to 140°	0° to 140°	Upright	000000	0000000

304 Stainless Steel Case with Brass Connection—Single Scale (in. of H₂O)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Gauges
Pressure Range, in. of H₂O	Graduation Marks, in. of H₂O	Numeric Increments, in. of H₂O
0 to 10	0.2	2
0 to 15	0.2	3
0 to 30	0.5	5
0 to 60	1	10
0 to 100	2	20
0 to 160	2	20
0 to 200	4	40

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Mounting Orientation		Each
NPT Male
4"	1/4	0° to 140°	0° to 140°	Upright	000000	0000000

304 Stainless Steel Case with Brass Connection—Single Scale (oz./in.²)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Gauges
Pressure Range, oz./in.²	Graduation Marks, oz./in.²	Numeric Increments, oz./in.²
0 to 10	0.2	2
0 to 15	0.2	3
0 to 30	0.5	5
0 to 60	1	10

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Mounting Orientation		Each
NPT Male
4"	1/4	0° to 140°	0° to 140°	Upright	000000	0000000

Digital High-Accuracy Pressure Gauges

ABS Plastic Case With Center Back Connection

Center Back Connection

A four-digit LCD display allows for easy reading of measurements. The LCD shuts off automatically to extend battery life. Gauges are commonly used with pneumatic regulators, compressors, and in critical processes that require high accuracy, such as hydraulic and laboratory applications.

For technical drawings and 3-D models, click on a part number.

ABS Plastic Case with Brass Connection—(psi, bar, kg/cm², MPa)

For Use With: Air, Carbon Dioxide, Hydrogen, Nitrogen, Natural Gas
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Ranges
Pressure Range
psi	bar	kg/cm²	MPa	Resolution, psi
0 to 145	0 to 10	0 to 10	0 to 1	0.1

							Center Back Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Batteries Included	Mounting Orientation	Features		Each
NPT Male
1 3/4"	1/8	-10° to 140°	-10° to 140°	Yes	Any	5-min. Automatic Shut-Off	000000	000000
1 3/4"	1/4	-10° to 140°	-10° to 140°	Yes	Any	5-min. Automatic Shut-Off	000000	00000
NPT Male with NIST Certificate
1 3/4"	1/8	-10° to 140°	-10° to 140°	Yes	Any	5-min. Automatic Shut-Off	00000000	000000
1 3/4"	1/4	-10° to 140°	-10° to 140°	Yes	Any	5-min. Automatic Shut-Off	00000000	000000

Vibration-Resistant Pressure Gauges

Dual Scale With Bottom Connection

Single Scale With Lower Back Connection

Single Scale With Bottom Connection

Single Scale With Center Back Connection

Center Back Connection

Bottom Connection

Center Back Connection (Panel Mount)

Lower Back Connection

A liquid-filled dial reduces needle flutter for precise readings in high-vibration applications. Gauges are commonly used with pumps, filters, regulators, and in process lines to measure and display pressure. Mount them with the dial face upright.

Gauges with 304 stainless steel case and ABS plastic case have better corrosion resistance than gauges with brass case.

For technical drawings and 3-D models, click on a part number.

ABS Plastic Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±2.5% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 30	0.5	5
0 to 60	1	10
0 to 100	2	20
0 to 160	4	40
0 to 300	5	50
0 to 2,000	40	400
0 to 3,000	50	500
0 to 5,000	100	1,000

							Center Back Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Liquid Type	Mounting Orientation		Each
NPT Male
1 1/2"	1/8	0° to 140°	0° to 140°	Black	Glycerin	Upright	00000000	000000

ABS Plastic Case with Brass Connection—Dual Scale (psi, kPa)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1% Mid Scale (Grade A)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kPa	psi	kPa	psi	kPa
0 to 30	0 to 205	0.5	5	5	50
0 to 60	0 to 410	1	10	10	100
0 to 100	0 to 680	2	20	20	200
0 to 160	0 to 1,100	4	40	40	400
0 to 200	0 to 1,360	4	40	40	400
0 to 300	0 to 2,050	5	50	50	500
0 to 400	0 to 2,700	10	100	100	1,000
0 to 600	0 to 4,100	10	100	100	1,000
0 to 1,000	0 to 6,800	20	200	200	2,000
0 to 1,500	0 to 10,200	20	200	300	3,000
0 to 2,000	0 to 13,600	40	400	400	4,000
0 to 3,000	0 to 20,500	50	500	500	5,000
0 to 5,000	0 to 34,000	100	1,000	1,000	10,000
0 to 6,000	0 to 41,000	100	1,000	1,000	10,000

Bottom Connection

NPT Male
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Liquid Type	Mounting Orientation		Each
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Glycerin	Upright	000000	000000

Center Back Connection

NPT Male
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Liquid Type	Mounting Orientation		Each
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Glycerin	Upright	000000	000000

Center Back Connection (Panel Mount)

NPT Male
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Liquid Type	Mounting Orientation	For Panel Cutout Dia.		Each
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Glycerin	Upright	2 1/2"	000000	000000

Brass Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, Hydraulic Fluid, and Natural Gas; except
With NIST Certificate: Air, Water, Hydraulic Fluid, Carbon Dioxide, Ethanol, and Natural Gas
Accuracy: ±1.5% Full Scale (Not Graded); except
2 1/2" Dia. NPT Male: ±1.% Mid Scale (Grade A)
4" Dia. NPT Male and NPT Male with NIST Certificate: ±1% Full Scale (Grade 1A)

	Available Pressure Ranges
	Gauges with NIST Certificate
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
NPT Male
2 1/2" Dial Diameter
0 to 30	0.5	5
0 to 60	1	10
0 to 100	2	20
0 to 160	4	40
0 to 200	4	40
0 to 300	5	50
0 to 400	10	100
0 to 600	10	100
0 to 800	20	200
0 to 1,000	20	200
0 to 1,500	20	300
0 to 2,000	40	400
0 to 3,000	50	500
0 to 5,000	100	1,000
0 to 6,000	100	1,000
0 to 10,000	200	2,000
4" Dial Diameter
0 to 30	0.5	5
0 to 60	1	10
0 to 100	2	20
0 to 160	2	20
0 to 200	4	40
0 to 300	5	50
0 to 400	5	50
0 to 600	10	100
0 to 800	10	100
0 to 1,000	20	200
0 to 1,500	20	300
0 to 2,000	40	400
0 to 3,000	50	500
0 to 5,000	100	1,000
0 to 6,000	100	1,000
0 to 10,000	200	2,000

Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Liquid Type	Mounting Orientation		Each
NPT Male with NIST Certificate
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	0000000
4"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	000000
Center Back Connection
NPT Male with NIST Certificate
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	000000
Lower Back Connection
NPT Male with NIST Certificate
4"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	000000

304 Stainless Steel Case with Brass Connection—Dual Scale (psi, bar)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1.5% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	bar	psi	bar	psi	bar
NPT Male
0 to 15	0 to 1	0.2	0.02	3	0.3
0 to 30	0 to 2	0.5	0.05	5	0.5
0 to 60	0 to 4.1	1	0.1	10	1
0 to 100	0 to 6.8	2	0.2	20	2
0 to 160	0 to 11	4	0.4	40	4
0 to 200	0 to 13.6	4	0.4	40	4
0 to 300	0 to 20.5	5	0.5	50	5
0 to 400	0 to 27	10	1	100	10
0 to 600	0 to 41	10	1	100	10
0 to 1,000	0 to 68	20	2	200	20
0 to 1,500	0 to 100	20	2	300	30
0 to 2,000	0 to 136	40	4	400	40
0 to 3,000	0 to 205	50	5	500	50
0 to 5,000	0 to 340	100	10	1,000	100
0 to 6,000	0 to 410	100	10	1,000	100
0 to 10,000	0 to 680	200	20	2,000	200
BSPP Male
0 to 14.4	0 to 1	0.4	0.02	4	0.2
0 to 22.8	0 to 1.6	0.6	0.04	6	0.4
0 to 36	0 to 2.5	1	0.05	10	0.5
0 to 57.6	0 to 4	1.6	0.1	16	1
0 to 86	0 to 6	2	0.1	20	1
0 to 144	0 to 10	4	0.2	40	2
0 to 228	0 to 16	6	0.4	60	4
0 to 360	0 to 25	10	0.5	100	5
0 to 576	0 to 40	16	1	160	10
0 to 860	0 to 60	20	1	200	10
0 to 1,440	0 to 100	40	2	400	20
0 to 2,280	0 to 160	60	4	600	40
0 to 3,600	0 to 250	100	5	1,000	50
0 to 5,800	0 to 400	160	10	1,600	100
0 to 8,600	0 to 600	200	10	2,000	100

						Bottom Connection		Center Back Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Liquid Type	Mounting Orientation		Each		Each
NPT Male
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	000000	0000000	000000
BSPP Male
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	00000	0000000	00000

Maximum-Indicating Vibration-Resistant Pressure Gauges

Bottom Connection

Center Back Connection

Center Back Connection (Panel Mount)

Bottom Connection

Center Back Connection

Center Back Connection (Panel Mount)

These gauges have a red needle that indicates the highest pressure reached since the last setting. They have a glycerin-filled dial that reduces needle flutter for precise readings in high-vibration applications. Use them with pumps, filters, regulators, and in process lines to measure and display pressure. Mount gauges with the dial face upright.

For technical drawings and 3-D models, click on a part number.

Brass Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, Ethanol, and Natural Gas
Accuracy: ±1.5% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 15	0.2	3
0 to 30	0.5	5
0 to 60	1	10
0 to 100	2	20
0 to 160	4	40
0 to 200	4	40
0 to 300	5	50
0 to 400	10	100
0 to 600	10	100
0 to 1,000	20	200
0 to 1,500	20	300
0 to 3,000	50	500
0 to 5,000	100	1,000
0 to 7,500	100	1,500
0 to 10,000	200	2,000
0 to 15,000	200	3,000

Bottom Connection

NPT Male
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Liquid Type	Mounting Orientation		Each
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	0000000
NPT Male with Calibration Certificate Traceable to NIST
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	000000

Center Back Connection

NPT Male
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Liquid Type	Mounting Orientation		Each
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	0000000
NPT Male with Calibration Certificate Traceable to NIST
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	0000000	000000

Center Back Connection (Panel Mount)

NPT Male
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Liquid Type	Mounting Orientation	For Panel Cutout Dia.		Each
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	2 1/2"	0000000	0000000
NPT Male with Calibration Certificate Traceable to NIST
2 1/2"	1/4	0° to 140°	0° to 140°	Glycerin	Upright	2 1/2"	0000000	000000

Vibration- and Corrosion-Resistant Pressure Gauges

Dual Scale With
Bottom Connection
And Yor-Lok Fitting

Dual Scale With Center
Back Connection
And Yor-Lok Fitting

Bottom Connection (Yor-Lok Fitting)

Center Back Connection (Yor-Lok Fitting)

Gauges with Yor-Lok connection allow for quick connections to metal tubing.

For technical drawings and 3-D models, click on a part number.

304 Stainless Steel Case with 316 Stainless Steel Connection—Dual Scale (psi, kPa)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, Ethyl Alcohol, and Natural Gas
Accuracy: ±1.5% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kPa	psi	kPa	psi	kPa
0 to 30	0 to 200	0.5	5	5	50
0 to 60	0 to 400	1	10	10	100
0 to 100	0 to 700	2	10	20	100
0 to 160	0 to 1,100	2	20	20	200
0 to 300	0 to 2,000	5	50	50	500
0 to 1,000	0 to 7,000	20	100	200	1,000

Bottom Connection
Dial Diameter	Environment Temp. Range, °F	Process Temp. Range, °F	For Tube OD	Mounting Orientation	Liquid Type	Compatible Tube Fittings		Each
Yor-Lok Female
2 1/2"	15° to 150°	15° to 150°	1/4"	Any	Glycerin	Parker A-Lok, Swagelok®	0000000	0000000
Center Back Connection
Yor-Lok Female
2 1/2"	15° to 150°	15° to 150°	1/4"	Any	Glycerin	Parker A-Lok, Swagelok®	0000000	000000

Gas Pressure Gauges

Single Scale With Bottom Connection

Bottom Connection

Use these gauges with pumps, filters, regulators, and in process lines to monitor the pressure of compressed gas. Mount them with the dial face upright. Gauges for use with acetylene can also be used in welding applications.

Gauges with brass case are cleaned to meet ASME B40.1, Level IV for oxygen service.

For technical drawings and 3-D models, click on a part number.

Brass Case with Brass Connection—Single Scale (psi)

For Use With: Air, Acetylene, Carbon Dioxide, and Oxygen
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 30	1	5
0 to 60	1	10
0 to 100	2	20
0 to 200	5	40
0 to 400	10	50
0 to 600	10	100
0 to 1,000	20	200
0 to 2,000	50	400
0 to 3,000	50	500
0 to 4,000	100	500

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Mounting Orientation		Each
NPT Male
2"	1/4	-40° to 140°	-40° to 140°	Upright	0000000	000000
2 1/2"	1/4	-40° to 140°	-40° to 140°	Upright	0000000	00000

Low-Pressure Gauges for Chemicals

With PVC Guard

With CPVC Guard

With Polypropylene Guard

Bottom Connection (Plastic Guard)

A plastic or stainless steel guard, also known as an isolator, protects the gauge from damage caused by corrosive chemicals. Use them with pumps, filters, regulators, and in process lines to measure and display pressures.

Polypropylene and 316 stainless steel guards are more chemical resistant than PVC and CPVC guards.

For technical drawings and 3-D models, click on a part number.

Painted Steel Case with PVC Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Bleach, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 140°	40° to 140°	Black	PVC Plastic	Gray	0000000	0000000
2"	1/2	40° to 140°	40° to 140°	Black	PVC Plastic	Gray	0000000	000000

Painted Steel Case with CPVC Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Bleach, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 190°	40° to 190°	Black	CPVC Plastic	Gray	0000000	0000000
2"	1/2	40° to 190°	40° to 190°	Black	CPVC Plastic	Gray	0000000	000000

Painted Steel Case with Polypropylene Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 240°	40° to 240°	Black	Polypropylene Plastic	White	0000000	0000000

Low-Pressure Differential Gauges with U-Tube

Also known as manometers, these gauges come with indicating liquid that moves up and down two columns—the difference in height between them is your pressure. They are commonly used to indicate clogged filters.

Magnet-mount gauges can be moved for use in multiple locations. Gauges with barbed tube connection have a flexible body that rolls up for storage or transport.

316 Stainless Steel Connection—(in. of H₂O)

For Use With: Acetylene, Air, Argon, Carbon Dioxide, and Steam
Accuracy: Not Rated (Not Graded)

						Environment Temp. Range		Process Temp. Range				Mounting
Pressure Range, in. of H₂O	Scale Range, in. of H₂O	Numeric Increments, in. of H₂O	Graduation Marks, in. of H₂O	Max. Pressure, psi	Ht.	Min., °F	Max., °F	Min., °F	Max., °F	Gender	Mount Type	Fasteners Included	Hole Dia.	Number of Holes		Each
With 1/4 NPT Female Threaded Pipe Connection
0-10	5-0-5	1	0.1	250	14"	35°	150°	35°	250°	Female	Screw On	No	3/16"	4	0000000	0000000
0-15	7-0-7	1	0.1	250	18"	35°	150°	35°	250°	Female	Screw On	No	3/16"	4	0000000	000000

Nylon Plastic Connection—(in. of H₂O)

For Use With: Air, Argon, Carbon Dioxide, and Hydrogen
Accuracy: Not Rated (Not Graded)

With Barbed Tube Connection for 3/16" Tube ID
Pressure Range, in. of H₂O	Scale Range, in. of H₂O	Numeric Increments, in. of H₂O	Graduation Marks, in. of H₂O	Max. Pressure	Ht.	Max. Process Temp., °F	Gender	Mount Type		Each
0-8	4-0-4	1	0.1	Not Rated	17"	130°	Male	Magnet	0000000	0000000
0-12	6-0-6	1	0.1	Not Rated	21"	130°	Male	Magnet	0000000	000000
0-16	8-0-8	1	0.1	Not Rated	25"	130°	Male	Magnet	0000000	000000
0-24	12-0-12	1	0.1	Not Rated	33"	130°	Male	Magnet	0000000	000000
0-30	15-0-15	1	0.1	Not Rated	39"	130°	Male	Magnet	0000000	000000
0-36	18-0-18	1	0.1	Not Rated	45"	130°	Male	Magnet	0000000	000000
0-48	24-0-24	1	0.1	Not Rated	57"	130°	Male	Magnet	0000000	000000
0-60	30-0-30	1	0.1	Not Rated	69"	130°	Male	Magnet	0000000	000000
0-72	36-0-36	1	0.1	Not Rated	81"	130°	Male	Magnet	0000000	000000

Brass Connection—(in. of H₂O)

For Use With: Air, Argon, Carbon Dioxide, and Hydrogen
Accuracy: Not Rated (Not Graded)

With Compression Tube Connection for 1/4" Tube OD
Pressure Range, in. of H₂O	Scale Range, in. of H₂O	Numeric Increments, in. of H₂O	Graduation Marks, in. of H₂O	Max. Pressure, psi	Ht.	Gender	Mount Type		Each
0-8	4-0-4	1	0.1	100	20"	Female	Magnet	0000000	0000000
0-12	6-0-6	1	0.1	100	25"	Female	Magnet	0000000	000000
0-16	8-0-8	1	0.1	100	30"	Female	Magnet	0000000	000000
0-20	10-0-10	1	0.1	100	34"	Female	Magnet	0000000	000000
0-24	12-0-12	1	0.1	100	39"	Female	Magnet	0000000	000000
0-36	18-0-18	1	0.1	100	58"	Female	Magnet	0000000	000000

Low-Pressure Differential Gauges with Color Indicator

A band of green, yellow, and red provides a clear indication of changes in differential pressure. Gauges are commonly used to indicate clogged filters.

For technical drawings and 3-D models, click on a part number.

Low-Pressure Differential Gauges with Color Indicator

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, Nitrogen, Hydrogen, Argon, and Acetylene
Accuracy: ±5% Full Scale (Not Graded)

	Pressure Range, psi
Pipe Size	Green Band	Yellow Band	Red Band	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F	Ht.	Wd.	Dp.	Case Color		Each
NPT Female
1/4	0-2	2-2.5	2.5-3.5	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	000000
1/4	0-3	3-4.5	4.5-5	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000
1/4	0-6	6-9	9-12	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000
1/4	0-7.5	7.5-12	12-15	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000
1/4	0-13	13-20	20-30	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000
1/4	0-19.5	19.5-29.5	29.5-43	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000

Absolute Pressure Gauges

Bottom Connection

Unlike other gauges that measure the difference between your system and the atmosphere, these give measurements relative to zero pressure. They’re often used in laboratory applications, and they are barometrically independent.

Stainless steel gauges have excellent corrosion resistance, so they can be used with more corrosive liquids and gasses than gauges with a brass connection and aluminum case.

For technical drawings and 3-D models, click on a part number.

Stainless Steel Case with Stainless Steel Connection—Single Scale (mbar)

For Use With: Air, Carbon Dioxide, Diesel Fuel, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Natural Gas, Water
Accuracy: ±1% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, mbar	Numeric Increments, mbar	Graduation Marks, mbar
0 to 25	5	0.5
0 to 60	10	1
0 to 160	50	5
0 to 600	100	10
0 to 1,000	200	20

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Lens Material		Each
BSPP Male
4"	1/2	5° to 120°	0° to 200°	Glass	000000	000000000

Tank-Mount Pressure-Regulating Valves for Air and Inert Gas

For Use With: See Table
Temperature Range: -20° to 120° F

These valves automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves have a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.

Choose a valve with a maximum outlet pressure that’s approximately twice your application’s normal operating pressure. Your operating pressure should never exceed 75% of the valve’s maximum outlet pressure.

Single-stage valves reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank. They’re best for applications where a constant outlet pressure isn’t critical.

Two-stage valves progressively reduce pressure over two steps for more consistent outlet pressure at all times. They’re often used in applications that require a constant outlet pressure regardless of the tank level.

Valves with a brass body have a longer service life than valves with a brass and steel body.

Valves with a stainless steel diaphragm can withstand harsh environments.

Single-Stage Valves

Female Oulet × Female Inlet Single-Stage Valve With Knob

Male Outlet × Female Inlet Single-Stage Valve With T-Handle

Inlet				Outlet				Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Carbon Dioxide
5/8"-18 UNF Female Outlet × NGO Female Inlet
CGA 320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 145	Knob	Brass	PTFE	Neoprene	00000000	0000000
9/16"-18 UNF Male Outlet × NGO Female Inlet
CGA 320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Rubber	0000000	000000

Two-Stage Valves

Female Outlet × Female Inlet Two-Stage Valve With T-Handle

Inlet				Outlet				Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Carbon Dioxide
1/4 NPT Female Outlet × NGO Female Inlet
CGA 320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Neoprene	00000000	0000000
CGA 320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Stainless Steel	00000000	000000
5/8"-18 UNF Female Outlet × NGO Female Inlet
CGA 320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	00000000	000000
CGA 320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass/Steel	PTFE	Rubber	0000000	000000

Easy-Read Tank-Mount Pressure-Regulating Valves with Flowmeter for Inert Gas

Female Inlet × Female Outlet With One Flowmeter

For Use With: See Table

Flowmeters let you see the gas flow rate from a distance. These valves automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. They have a gauge for monitoring inlet pressure from the tank.

Valves with one flowmeter are for one piece of equipment on a tank. The flowmeter has a single scale.

Adapters (sold separately) change 5/8"-18 outlets to 9/16"-18 male connections, and vice versa.

For Use With Carbon Dioxide

Inlet					Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Stage	Thread Size	Location	Thread Direction	Flow Range, scfh	Number of Flowmeters	Body	Seal	Diaphragm		Each
UNF Female Outlet × NGO Female Inlet
CGA 320	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 to 70	1	Brass	PTFE	Neoprene	00000000	0000000

Optional Adapter

00000000

Each

000000

Tank-Mount Pressure-Regulating Valves with Flowmeter for Inert Gas

For Use With: See Table
Temperature Range: -20° to 120° F

Commonly used in TIG welding where gas flow/coverage is a concern, these valves measure the gas flow rate in addition to regulating pressure. They automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves have a gauge to monitor the outlet flow rate and a second gauge to monitor inlet pressure from the tank. They are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank.

For Use With Carbon Dioxide

Female Outlet × Female Inlet

Female Outlet × Female Inlet With Hose

Inlet					Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Stage	Thread Size	Location	Thread Direction	Flow Range, scfh	Flow Gauge Included	Body	Seal	Diaphragm	Includes		Each
UNF Female Outlet × NGO Female Inlet
CGA 320	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 to 60	Yes	Brass	PTFE	Neoprene	__	0000000	0000000
CGA 320	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 to 60	Yes	Brass	PTFE	Neoprene	10-ft. long, 3/16" dia. hose with 5/8"-18 male fittings on both ends	0000000	000000
CGA 320	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 to 100	Yes	Brass	PTFE	Neoprene	__	0000000	000000

High-Purity Tank-Mount Pressure-Regulating Valves for Inert Gas

For Use With: See Table
Temperature Range: -20° to 120° F

Reduce contaminants in research sample systems, emission monitoring systems, chromatography, and other high-purity applications that use argon, helium, nitrogen, or carbon dioxide. These valves have a 316 stainless steel and brass body with a smooth finish to reduce dust collection and internal components designed to protect the seal and diaphragm from contamination. They automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Outlet fittings are Swagelok® for a leak-free seal around hard metal tubing in high-pressure lines. Also known as instrumentation fittings, Swagelok® fittings are compatible with Parker A-Lok, Gyrolok, Bilok, and Tylok fittings. Valves have a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.

Chrome-plated valves add a layer of corrosion resistance.

For Use With Carbon Dioxide

Swagelok® Female Outlet × NGO Female Inlet (Brass)

Swagelok® Female Outlet × NGO Female Inlet (Chrome-Plated Brass)

Inlet					Outlet
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Stage	For Tube OD	Location	Pressure Range, psi	Pressure Adjustment Method		Each
Swagelok® Female Outlet × NGO Female Inlet
Brass Body—316 Stainless Steel Diaphragm and PTFE Seal
CGA 320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 15	Knob	0000000	0000000
CGA 320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 125	Knob	0000000	000000
CGA 320	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 125	Knob	0000000	000000
Chrome-Plated Brass Body—316 Stainless Steel Diaphragm and PTFE Seal
CGA 320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 15	Knob	0000000	000000
CGA 320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 50	Knob	0000000	000000
CGA 320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 125	Knob	0000000	000000
CGA 320	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 15	Knob	0000000	000000
CGA 320	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 50	Knob	0000000	000000
CGA 320	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 125	Knob	0000000	000000

Tank-Mount Pressure-Regulating Valves for Cryogenic Cylinders

For Use With: See Table
Temperature Range: -20° to 120° F

Automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. These valves can remove gases from liquid cryogenic cylinders. They have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves come with a gauge to monitor outlet pressure. They are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank.

	Inlet				Outlet
For Use With	CGA Number	Location	Thread Direction	Stage	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method		Each
UNF Male Outlet × NGO Female Inlet
Brass Body—Stainless Steel Diaphragm and PTFE Seal
Carbon Dioxide	CGA 320	Side	Right Hand	Single	9/16"-18	Bottom	Right Hand	0 to 350	T-Handle	0000000	0000000