20 psi Pressure Gauges | McMaster-Carr

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12 Products

About Pressure Gauges

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	0-13	13-20	20-30	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	0000000

High-Pressure Differential Gauges

These gauges are able to withstand line pressures up to 3,000 psi. They are commonly used to measure pressure differences in pumps and filters.

Gauges with 316 stainless steel case are more corrosion resistant than gauges with an aluminum case.

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

Aluminum Case with Aluminum Connection—Single Scale (psi)

For Use With: Water, Hydraulic Fluid, and Gasoline
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
2 1/2" Dial Diameter
0 to 20	1	5
4 1/2" Dial Diameter
0 to 20	1	5

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F		Each
2 1/2"	1/4	3,000	0° to 150°	0° to 200°	000000	0000000
4 1/2"	1/4	3,000	0° to 150°	0° to 200°	000000	000000

316 Stainless Steel Case with 316 Stainless Steel Connection—Single Scale (psi)

For Use With: Water, Hydraulic Fluid, and Gasoline
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
2 1/2" Dial Diameter
0 to 20	1	5
4 1/2" Dial Diameter
0 to 20	1	5

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F		Each
2 1/2"	1/4	3,000	0° to 150°	0° to 200°	000000	0000000
4 1/2"	1/4	3,000	0° to 150°	0° to 200°	000000	000000

Differential Pressure and Vacuum Gauges with Digital Display

Gauges have a four-digit LCD display for easy reading of measurements. Commonly used to indicate clogged filters, these gauges display the difference between two pressure or vacuum measurements. They are also known as compound gauges.

Aluminum Case with Brass Connection—(psi, kPa, in. of H₂O, in. of Hg, mbar)

For Use With: Air
Accuracy: ±0.5% Full Scale (Not Graded)

Pressure Range
psi	kPa	in. of H₂O	mbar	Vacuum Range, in. of Hg	Resolution, in. of H₂O	Max. Pressure, psi	For Tube ID	Environment Temp. Range, °F	Process Temp. Range, °F	Digit Ht.	Batteries Included	Features		Each
Barbed Tube Connection
0-20	0-137.9	0-553"	0-1,379	40.72"-0	0.01	60	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	0000000
Barbed Tube Connection with Calibration Certificate Traceable to NIST
0-20	0-137.9	0-553"	0-1,379	40.72"-0	0.01	60	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000

Tire Pressure Gauges with Indicator Bar

With One Angled Head

A bar slides out of the top of these gauges to display pressure reading.

		Pressure Range
Head Type	Number of Heads	psi	kPa	Numeric Increments, psi	Accuracy	Overall Lg.	Finish	Material	Indicator Bar Material	Features		Each
Angled	1	2-20	20-140	1	±1 psi	6"	Nickel Plated	Brass	Plastic	Pocket Clip	0000000	000000