Salt Water Indicators | McMaster-Carr

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Warning: Products have one, but not necessarily all, of the selected characteristics.

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

	System of Measurement System of Measurement

Inch

	Connection Center-to-Center Connection Center-to-Center

	Material Material

Brass

Bronze

Stainless Steel

	Connection Location Connection Location


Bottom	Lower Back

	Connection Style Connection Style

Threaded

Quick Clamp

	Scale Scale

kg/cm²

psi

	Mount Type Mount Type

Bolt On

Clamp On

Screw

	Connection Type Connection Type


Pipe	Tube

	Body Material Body Material

Stainless Steel

Plastic

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Dial Diameter Dial Diameter

4 1/2"

	Measures Measures

Pressure

	Maximum Process Temperature Maximum Process Temperature

	Dial Type Dial Type

	Dry

	Connection Material Connection Material

Stainless Steel

Plastic

	Gender Gender

Female

Male

	Maximum Temperature Maximum Temperature

	Maximum Pressure Maximum Pressure

	Maximum Environment Temperature Maximum Environment Temperature

	Scale Type Scale Type


Single	Dual

	Window Material Window Material

Glass

Plastic

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49 Products

About Pressure Gauges

About Pipe Size

Mount these indicators on the outside of tanks in food, pharmaceutical, and other sanitary environments to monitor their liquid levels. Made from 316 stainless steel, they will not corrode from frequent washdowns with harsh cleaners and sanitizers. Rounded edges and polished surfaces prevent the risk of bacteria growth. These indicators have an impact-resistant polycarbonate shield that protects the glass window while still letting you see the liquid level. The liquid level inside these indicators matches the level in your tank, making it easy to view readings at a glance. Attach these indicators to tanks with quick-clamp sanitary fittings for fast installation and easy removal for cleaning or moving them.

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

						Temperature Range, °F			Window		Smoothness, Ra
Connection Center-to-Center	Overall Height	Window Height	Body Width	Maximum Pressure	Maximum Vacuum @ Temperature	Minimum	Maximum	Fitting Material	Material	Shield Material	Interior	Exterior		Each
316 Stainless Steel
For 3/4" Tube OD
12"	13 1/4"	10 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	000000000
14"	15 1/4"	12 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000
18"	19 1/4"	16 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000
20"	21 1/4"	18 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000
24"	25 1/4"	22 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000
26"	27 1/4"	24 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000
32"	33 1/4"	30 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000
38"	39 1/4"	36 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000
44"	45 1/4"	42 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000
50"	51 1/4"	48 3/4"	4"	150 psi @ 72° F	29 in. of Hg @ 72° F	35°	350°	316 Stainless Steel	Glass	Polycarbonate Plastic	20	42	00000000	00000000

Level Indicators with Shut-Off Valve

Bronze

Brass

Shut-off valves stop flow so you can clean and replace gauge glass without removing these indicators from your equipment.

Indicators with needle stem have a stem in the lower shut-off valve to clear the orifice as the valve closes.

Indicators with automatic shut-off will temporarily close if the gauge glass breaks. The valves must be closed manually for permanent shut-off.

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

Level Indicators
							Temp. Range, °F						Replacement Glass
Connection Ctr.-to-Ctr.	Overall Ht.	Window Ht.	Body Wd.	Drain Cock Dia.	Max. Pressure	Max. Steam Pressure	Min.	Max.	For Use With	No. of Guard Rods		Each		Each
Bronze
3/8 NPT Male Thread with Needle Stem
11 1/4"	13 5/8"	7"	3 7/8"	1/4"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	0000000	0000000	000000
1/2 NPT Male Thread with Needle Stem
13 1/4"	15 5/8"	9"	3 15/16"	1/4"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	000000	0000000	00000
1/2 NPT Male Thread with Needle Stem and Automatic Shut-Off
13 1/4"	15 5/8"	9"	3 15/16"	1/4"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	000000	0000000	00000
3/4 NPT Male Thread with Needle Stem
17 1/2"	20"	13"	4 3/16"	1/4"	370 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	000000	0000000	00000
3/4 NPT Male Thread with Needle Stem and Automatic Shut-Off
17 1/2"	20"	13"	4 3/16"	1/4"	370 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	000000	0000000	00000
Brass
1/2 NPT Male Thread with Needle Stem
14"	16 1/4"	9"	4 5/8"	1/4"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	4	0000000	000000	0000000	00000
1/2 NPT Male Thread with Needle Stem and Automatic Shut-Off
14"	16 1/4"	9"	4 5/8"	1/4"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	4	0000000	000000	0000000	00000
3/4 NPT Male Thread with Needle Stem
18"	20 1/4"	13"	4 5/16"	1/4"	370 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	4	0000000	000000	0000000	00000
3/4 NPT Male Thread with Needle Stem and Automatic Shut-Off
18"	20 1/4"	13"	4 5/16"	1/4"	370 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	4	0000000	000000	0000000	00000

Sights for Quick-Clamp Sanitary Tube Fittings

Sight Shown Assembled With
Gasket, Quick-Clamp Fitting, And
Tube Fitting (All Sold Separately)

Plastic Window with 304 Stainless Steel Ring

Glass Window with 2205 Stainless Steel Ring

Monitor food, brewery, chemical, pharmaceutical, and biotech processing lines with these sights that attach to quick-clamp fittings for fast installation and easy removal for cleaning. All have a one-piece design, so there are no crevices where bacteria can grow. A quick-clamp fitting, gasket, and tube fitting are required (sold separately).

304 stainless steel sights have a ring that's embedded around their shatter-resistant plastic window. This design protects the sights from chipping or cracking while under the stress of the quick-clamp fitting. All withstand harsh cleaners and sanitizers for clean-in-place (CIP) and steam-in-place (SIP) applications. They do not contain Bisphenol A (BPA), Bisphenol B (BPB), or BPA derivatives (BPX), which are chemicals that can contaminate your process lines. All meet ASME BPE design standards for bioprocessing equipment that ensure purity and safety.

For superior strength and reliability, choose 2205 stainless steel sights. All have a glass window that’s melted around a high-strength ring, so they won’t shatter, leak, or lose their shape under high pressure, heat, chemicals, or impact. They withstand harsh cleaners and sanitizers for clean-in-place (CIP) and steam-in-place (SIP) applications. USP Class VI and TUV Rheinland Certified, these sights meet safety standards in the U.S. and Europe. They also meet DIN standards for glass materials used in sights, ASTM standards for materials used in boilers and pressure vessels, and ASME BPE design standards for bioprocessing equipment that ensure purity and safety.

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

				Temp. Range, °F
For Tube OD	For Flange OD	Window Dia.	Max. Pressure	Min.	Max.	For Use With	Features	Specifications Met		Each
304 Stainless Steel Ring with Plastic Window
1"	1.98"	1 1/4"	150 psi @ 70° F	Not Rated	200°	Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam	One-Piece Construction	ASME BPE	0000000	000000
2"	2.52"	1 3/4"	150 psi @ 70° F	Not Rated	200°	Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam	One-Piece Construction	ASME BPE	0000000	00000
3"	3.58"	2 3/8"	60 psi @ 70° F	Not Rated	200°	Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam	One-Piece Construction	ASME BPE	0000000	000000
4"	4.68"	3 1/4"	30 psi @ 70° F	Not Rated	200°	Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam	One-Piece Construction	ASME BPE	0000000	000000
2205 Stainless Steel Ring with Glass Window
1", 1 1/2"	1.98"	1"	230 psi @ 70° F	-40°	500°	Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam	One-Piece Construction	ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI	0000000	000000
2"	2.52"	1 9/16"	230 psi @ 70° F	-40°	500°	Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam	One-Piece Construction	ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI	0000000	000000
3"	3.58"	1 1/2"	150 psi @ 70° F	-40°	500°	Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam	One-Piece Construction	ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI	0000000	000000
4"	4.68"	1 1/8"	150 psi @ 70° F	-40°	500°	Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam	One-Piece Construction	ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI	0000000	000000

Extreme Vibration-Resistant Pressure Gauges

Bottom Connection (Flange Mount)

Lower Back Connection (Flange Mount)

Bottom Connection (Flange Mount)

Lower Back Connection (Flange Mount)

Unlike other gauges that have multiple moving parts that can shake loose, these have only one internal part. They are the most shock-resistant gauges we offer and allow for precise readings in high-vibration applications. Use them with pumps, filters, regulators, and in process lines to measure and display pressure. Gauges meet MIL-G-18997 for resistance to salt spray and washdown environments. They have a safety case that blows out in the back under excess pressure, protecting the operator in front. Mount them with the dial face upright.

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

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

For Use With: Air, Water, Hydraulic Fluid, Gasoline, Diesel Fuel, Natural Gas, Refrigerant, and Salt Water
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 100	1	10
0 to 200	2	20
0 to 1,000	10	100
0 to 2,000	20	200
0 to 5,000	50	500

				Mounting		Bolt			Flange
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Orientation	Fasteners Included	Circle Dia.	Hole Dia.	No. of Holes	Location	OD		Each
Bottom Connection (Flange Mount)
NPT Male
4 1/2"	1/4	-65° to 400°	-65° to 600°	Upright	No	5 3/8"	7/32"	3	Back	5 13/16"	0000000	0000000
Lower Back Connection (Flange Mount)
NPT Male
4 1/2"	1/4	-65° to 400°	-65° to 600°	Upright	No	5 3/8"	7/32"	3	Back	5 13/16"	0000000	000000

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

Gauge Guards

316 Stainless Steel Guard

316 Stainless Steel Guard With Drain Port

Plastic Guard

Also known as isolators or diaphragm seals, these protect gauges from corrosive process media. Fill guards with ISO Grade 32 hydraulic oil (not included) before use.

316 stainless steel guards provide excellent corrosion and chemical resistance and can handle higher temperatures and pressures than plastic guards.

Polypropylene and PVDF guards are more chemical resistant than PVC and CPVC guards.

Guards with drain port allow you to remove process media.

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

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Min. Pressure, psi	Max. Pressure	Max. Temp., °F	Ht.		Each
316 Stainless Steel Body
1/4 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	1 1/2"	0000000	0000000
1/2 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	1 1/2"	0000000	000000
1/2 NPT Female	1/2 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	1 1/2"	0000000	000000
316 Stainless Steel Body with 1/4 NPT Female Drain Port
1/4 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	2"	0000000	000000
1/2 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	2"	0000000	000000
1/2 NPT Female	1/2 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	2"	0000000	000000
PVC Plastic Body
1/4 NPT Female	1/4 NPT Female	Fluoroelastomer Rubber	Bleach, Boric Acid, Hydraulic Fluid, Salt Water, Water	__	150 psi @ 72° F	140°	2 3/4"	0000000	000000
1/2 NPT Female	1/4 NPT Female	Fluoroelastomer Rubber	Bleach, Boric Acid, Hydraulic Fluid, Salt Water, Water	__	150 psi @ 72° F	140°	2 3/4"	0000000	000000
CPVC Plastic Body
1/4 NPT Female	1/4 NPT Female	Fluoroelastomer Rubber	Bleach, Boric Acid, Hydraulic Fluid, Salt Water, Water	__	150 psi @ 72° F	190°	2 3/4"	0000000	000000
1/2 NPT Female	1/4 NPT Female	Fluoroelastomer Rubber	Bleach, Boric Acid, Hydraulic Fluid, Salt Water, Water	__	150 psi @ 72° F	190°	2 3/4"	0000000	000000
Polypropylene Plastic Body
1/4 NPT Female	1/4 NPT Female	Fluoroelastomer Rubber	Bleach, Boric Acid, Carbon Dioxide, Hydraulic Fluid, Salt Water, Water	__	150 psi @ 72° F	240°	2 3/4"	0000000	000000
PVDF Plastic Body
1/2 NPT Female	1/4 NPT Female	Fluoroelastomer Rubber	Bleach, Boric Acid, Carbon Dioxide, Hydraulic Fluid, Salt Water, Water	__	150 psi @ 72° F	300°	2 3/4"	0000000	000000

About Pressure Gauges

About Pipe Size

Sanitary Level Indicators

Level Indicators with Shut-Off Valve

Sights for Quick-Clamp Sanitary Tube Fittings

Extreme Vibration-Resistant Pressure Gauges

Low-Pressure Gauges for Chemicals

Gauge Guards