Pressure Gauge Seals | McMaster-Carr

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1,000 psi to 2,999 psi

3,000 psi to 4,999 psi

5,000 psi to 9,999 psi

10,000 psi or greater

Less than 250 kPa

250 kPa to 999 kPa

1,000 kPa to 1,999 kPa

2,000 kPa to 2,999 kPa

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Connects To

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Pounds per Square Inch

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2B999

EAR99

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Not Compliant

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78 Products

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Gauge Guards

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

316 Stainless Steel Body

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

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Min. Pressure, psi	Max. Pressure @ Temp.	Max. Temp., ° F	Ht.		Each
1/4 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	1 3/4"	3882K51	0000000
1/2 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	1 3/4"	3882K52	000000
1/2 NPT Female	1/2 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	1 1/2"	3882K53	000000

316 Stainless Steel Body with 1/4 NPT Female Drain Port

Image of Product. Front orientation. 316 Stainless Steel Body. Gauge Guards, 1/4 NPT Female Drain Port.

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

Guards with drain port allow you to remove process media.

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Min. Pressure, psi	Max. Pressure @ Temp.	Max. Temp., ° F	Ht.		Each
1/4 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	2"	3882K54	0000000
1/2 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	2"	3882K55	000000
1/2 NPT Female	1/2 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	2"	3882K56	000000

PVC Body

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Max. Pressure @ Temp.	Max. Temp., ° F	Ht.		Each
1/4 NPT Female	1/4 NPT Female	Fluoroelastomer	Boric Acid, Hydraulic Fluid, Salt Water, Sodium Hypochlorite (Bleach), Water	150 psi @ 72° F	140	2 3/4"	4143K11	0000000
1/2 NPT Female	1/4 NPT Female	Fluoroelastomer	Boric Acid, Hydraulic Fluid, Salt Water, Sodium Hypochlorite (Bleach), Water	150 psi @ 72° F	140	2 3/4"	4143K21	000000

CPVC Body

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Max. Pressure @ Temp.	Max. Temp., ° F	Ht.		Each
1/4 NPT Female	1/4 NPT Female	Fluoroelastomer	Boric Acid, Hydraulic Fluid, Salt Water, Sodium Hypochlorite (Bleach), Water	150 psi @ 72° F	190	2 3/4"	4334K31	0000000
1/2 NPT Female	1/4 NPT Female	Fluoroelastomer	Boric Acid, Hydraulic Fluid, Salt Water, Sodium Hypochlorite (Bleach), Water	150 psi @ 72° F	190	2 3/4"	4334K41	000000

Polypropylene Body

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

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Max. Pressure @ Temp.	Max. Temp., ° F	Ht.		Each
1/4 NPT Female	1/4 NPT Female	Fluoroelastomer	Boric Acid, Carbon Dioxide, Hydraulic Fluid, Salt Water, Sodium Hypochlorite (Bleach), Water	150 psi @ 72° F	240	2 3/4"	4199K51	0000000

PVDF Body

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

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Max. Pressure @ Temp.	Max. Temp., ° F	Ht.		Each
1/2 NPT Female	1/4 NPT Female	Fluoroelastomer	Boric Acid, Carbon Dioxide, Hydraulic Fluid, Salt Water, Sodium Hypochlorite (Bleach), Water	150 psi @ 72° F	300	2 3/4"	4354K81	0000000

Low-Pressure Gauges for Chemicals

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.

304 Stainless Steel Case with 316 Stainless Steel Connection—Dual Scale (Pounds per Square Inch, Kilopascals)


316 Stainless Steel Guard	Bottom Connection (316 Stainless Steel Guard)

316 Stainless Steel Guard—Polypropylene and 316 stainless steel guards are more chemical resistant than PVC and CPVC guards.

			Temp. Range, ° F
	Dial Dia.	Pipe Size	Environment	Process	For Use With	Accuracy	Guard Material	Choose a Pressure Range
Any-Angle Mount







				NPT Female

				2 1/2"	1/4	-40 to 140	0 to 210	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 15 psi/0 to 100 kPa, 0 to 30 psi/0 to 200 kPa, 0 to 60 psi/0 to 400 kPa, 0 to 100 psi/0 to 700 kPa, 0 to 160 psi/0 to 1,100 kPa	3813K13


				2 1/2"	1/2	-40 to 140	0 to 210	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 15 psi/0 to 100 kPa, 0 to 30 psi/0 to 200 kPa, 0 to 60 psi/0 to 400 kPa, 0 to 100 psi/0 to 700 kPa, 0 to 160 psi/0 to 1,100 kPa	3813K14
				4"	1/4	-40 to 140	0 to 210	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 15 psi/0 to 100 kPa, 0 to 30 psi/0 to 200 kPa, 0 to 60 psi/0 to 400 kPa, 0 to 100 psi/0 to 700 kPa, 0 to 160 psi/0 to 1,100 kPa	3813K11
				4"	1/2	-40 to 140	0 to 210	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 15 psi/0 to 100 kPa, 0 to 30 psi/0 to 200 kPa, 0 to 60 psi/0 to 400 kPa, 0 to 100 psi/0 to 700 kPa, 0 to 160 psi/0 to 1,100 kPa	3813K12

Painted Steel Case with PVC Connection—Dual Scale (Pounds per Square Inch, Kilograms per Square Centimeter)


PVC Guard	Bottom Connection (PVC, CPVC, and Polypropylene Guards)

			Temp. Range, ° F							Bottom Connection
Dial Dia.	Pipe Size	Case Color	Environment	Process	For Use With	Accuracy	Guard Material	Guard Color	Choose a Pressure Range		Each







			NPT Female

			2"	1/4	Black	40 to 140	40 to 140	Boric Acid Carbon Dioxide Hydraulic Fluid Salt Water Sodium Hypochlorite (Bleach) Water	±2% Midscale (Grade B)	PVC	Gray	0 to 30 psi/0 to 2.1 kg per cm², 0 to 60 psi/0 to 4.2 kg per cm², 0 to 150 psi/0 to 11.2 kg per cm²	4091K23	0000000


			2"	1/2	Black	40 to 140	40 to 140	Boric Acid Carbon Dioxide Hydraulic Fluid Salt Water Sodium Hypochlorite (Bleach) Water	±2% Midscale (Grade B)	PVC	Gray	0 to 30 psi/0 to 2.1 kg per cm², 0 to 60 psi/0 to 4.2 kg per cm², 0 to 150 psi/0 to 11.2 kg per cm²	4091K24	000000

Painted Steel Case with CPVC Connection—Dual Scale (Pounds per Square Inch, Kilograms per Square Centimeter)


CPVC Guard	Bottom Connection (PVC, CPVC, and Polypropylene Guards)

			Temp. Range, ° F							Bottom Connection
Dial Dia.	Pipe Size	Case Color	Environment	Process	For Use With	Accuracy	Guard Material	Guard Color	Choose a Pressure Range		Each







			NPT Female

			2"	1/4	Black	40 to 190	40 to 190	Boric Acid Carbon Dioxide Hydraulic Fluid Salt Water Sodium Hypochlorite (Bleach) Water	±2% Midscale (Grade B)	CPVC	Gray	0 to 30 psi/0 to 2.1 kg per cm², 0 to 60 psi/0 to 4.2 kg per cm², 0 to 150 psi/0 to 11.2 kg per cm²	4147K41	0000000


			2"	1/2	Black	40 to 190	40 to 190	Boric Acid Carbon Dioxide Hydraulic Fluid Salt Water Sodium Hypochlorite (Bleach) Water	±2% Midscale (Grade B)	CPVC	Gray	0 to 30 psi/0 to 2.1 kg per cm², 0 to 60 psi/0 to 4.2 kg per cm², 0 to 150 psi/0 to 11.2 kg per cm²	4147K42	000000

Painted Steel Case with Polypropylene Connection—Dual Scale (Pounds per Square Inch, Kilograms per Square Centimeter)


Polypropylene Guard	Bottom Connection (PVC, CPVC, and Polypropylene Guards)

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

			Temp. Range, ° F							Bottom Connection
Dial Dia.	Pipe Size	Case Color	Environment	Process	For Use With	Accuracy	Guard Material	Guard Color	Choose a Pressure Range		Each







			NPT Female

			2"	1/4	Black	40 to 240	40 to 240	Boric Acid Carbon Dioxide Hydraulic Fluid Salt Water Water	±2% Midscale (Grade B)	Polypropylene	White	0 to 30 psi/0 to 2.1 kg per cm², 0 to 60 psi/0 to 4.2 kg per cm², 0 to 150 psi/0 to 11.2 kg per cm²	4134K23	0000000

Pressure Gauge Snubbers

Also known as dampers, these reduce the flow of fluids into your pressure gauge to damp vibration, pulsation, and pressure spikes. The smaller the orifice, the greater the reduction in flow.

Pressure Gauge Snubbers

Five Orifice Inserts (0.179", 0.180", 0.183", 0.185", and 0.189")—Snubbers with five orifice inserts allow you to change the level of vibration and pressure damping as needed; remove the set screw to exchange inserts and then replace the set screw to use.

	Pipe Connections
	Inlet	Outlet	Max. Pressure, psi	Ht.	Includes	Choose an Orifice Diameter		Each
Brass



		1/8 NPT Male	1/8 NPT Female	2,000	7/8"	—	0.004", 0.008", 0.015"	3820K26	000000


		1/4 NPT Male	1/4 NPT Female	2,000	1 1/4"	—	0.004", 0.008", 0.015"	3820K27	00000
		1/4 NPT Male	1/4 NPT Female	6,000	1 9/16"	Five Orifice Inserts (0.179", 0.180", 0.183", 0.185", and 0.189")	—	4072K6	00000
		1/2 NPT Male	1/2 NPT Female	2,000	1 11/16"	—	0.004", 0.008", 0.015"	3820K28	00000


		303 Stainless Steel



				1/8 NPT Male	1/8 NPT Female	4,000	7/8"	—	0.004", 0.008", 0.015"	3820K36	00000


				1/4 NPT Male	1/4 NPT Female	4,000	1 1/4"	—	0.004", 0.008", 0.015"	3820K37	00000
				1/2 NPT Male	1/2 NPT Female	4,000	1 11/16"	—	0.004", 0.008", 0.015"	3820K38	00000


				316 Stainless Steel



						1/4 NPT Male	1/4 NPT Female	15,000	1 9/16"	Five Orifice Inserts (0.179", 0.180", 0.183", 0.185", and 0.189")	—	4072K8	00000


						1/2 NPT Male	1/2 NPT Female	15,000	1 7/8"	Five Orifice Inserts (0.179", 0.180", 0.183", 0.185", and 0.189")	—	4072K9	000000

Pressure Gauge Snubbers with Filter Disc

Snubbers with filter disc prevent damage to your gauge by trapping particles in your process media.

	Pipe Connections
	Inlet	Outlet	Max. Pressure, psi	Ht.	Orifice Dia.	Removes Particle Size Down To, μm		Each
Brass



		1/8 NPT Male	1/8 NPT Female	3,000	1 1/8"	3/16"	0.5, 1, 5, 7, 10, 45, 75	4034K1	000000


		1/4 NPT Male	1/4 NPT Female	10,000	1 1/2"	1/4"	0.5, 1, 5, 7, 10, 45, 75	4034K2	00000
		1/2 NPT Male	1/2 NPT Female	10,000	2 3/16"	1/4"	0.5, 1, 5, 7, 10, 45, 75	4034K3	00000


		303 Stainless Steel



				1/8 NPT Male	1/8 NPT Female	5,000	1 1/8"	3/16"	0.5, 1, 5, 7, 10, 45, 75	4034K4	00000


				1/4 NPT Male	1/4 NPT Female	15,000	1 1/2"	1/4"	0.5, 1, 5, 7, 10, 45, 75	4034K5	00000
				1/2 NPT Male	1/2 NPT Female	15,000	2 3/16"	1/4"	0.5, 1, 5, 7, 10, 45, 75	4034K6	00000

Sanitary Gauge Guards

Keeping corrosive substances from touching pressure gauges used in food-processing and pharmaceutical plants, these guards have a sanitary design. Made of 316 stainless steel, they won’t rust from frequent washdowns with harsh cleaners and sanitizers. They have continuously-welded seams and polished surfaces, so there aren’t any pits for bacteria to grow in. Removing them for cleaning and maintenance is easy thanks to their quick-clamp connection, which is sometimes called a tri-clamp.

Also known as isolators and diaphragm seals, these guards have a 316 stainless steel gasket to shield the pressure gauges from corrosion. Before use, fill the guards with fluid such as glycerin or silicone that’s suitable for food contact.

316 Stainless Steel Body

Image of Product. Front orientation. Gauge Guards. Sanitary Gauge Guards.

	Outlet Quick-Clamp Tube Connection
Inlet Pipe Connection	For Tube OD	Flange OD	Gasket Material	For Use With	Min. Pressure, psi	Max. Pressure @ Temp.	Max. Temp.	Ht.	Interior Smoothness, Ra		Each
1/4 NPT Female	1 1/2"	1.984"	316 Stainless Steel	Acetylene, Air, Ammonia, Beverage, Boric Acid, Carbon Dioxide, Diesel Fuel, Ethanol, Food, Gasoline, Hydraulic Fluid, Hydrogen, Oxygen, Pharmaceuticals, Wastewater, Water	30	Not Rated	Not Rated	1 3/8"	32	6363N11	0000000
1/4 NPT Female	2"	2.516"	316 Stainless Steel	Acetylene, Air, Ammonia, Beverage, Boric Acid, Carbon Dioxide, Diesel Fuel, Ethanol, Food, Gasoline, Hydraulic Fluid, Hydrogen, Oxygen, Pharmaceuticals, Wastewater, Water	30	Not Rated	Not Rated	1 1/8"	32	6363N12	000000
1/2 NPT Female	1 1/2"	1.984"	316 Stainless Steel	Acetylene, Air, Ammonia, Beverage, Boric Acid, Carbon Dioxide, Diesel Fuel, Ethanol, Food, Gasoline, Hydraulic Fluid, Hydrogen, Oxygen, Pharmaceuticals, Wastewater, Water	30	Not Rated	Not Rated	1 3/8"	32	6363N13	000000

Vibration-Resistant Pressure Gauges for Chemicals

These gauges have a glycerin-filled dial that reduces needle flutter for precise readings in high-vibration applications reaching 2,000 psi. A 316 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 pressure.

304 Stainless Steel Case with 316 Stainless Steel Connection—Dual Scale (Pounds per Square Inch, Kilopascals)


	Bottom Connection

			Temp. Range, ° F							Bottom Connection
	Dial Dia.	Pipe Size	Environment	Process	Liquid Type	For Use With	Accuracy	Guard Material	Choose a Pressure Range		Each
Any-Angle Mount







				NPT Female

				2 1/2"	1/4	35 to 140	0 to 210	Glycerin	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 15 psi/0 to 100 kPa, 0 to 30 psi/0 to 200 kPa, 0 to 60 psi/0 to 400 kPa, 0 to 100 psi/0 to 700 kPa, 0 to 160 psi/0 to 1,100 kPa, 0 to 200 psi/0 to 1,400 kPa, 0 to 300 psi/0 to 2,000 kPa, 0 to 400 psi/0 to 2,800 kPa, 0 to 600 psi/0 to 4,000 kPa, 0 to 1,000 psi/0 to 7,000 kPa, 0 to 2,000 psi/0 to 14,000 kPa	3813K5	0000000


				2 1/2"	1/2	35 to 140	0 to 210	Glycerin	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 15 psi/0 to 100 kPa, 0 to 30 psi/0 to 200 kPa, 0 to 60 psi/0 to 400 kPa, 0 to 100 psi/0 to 700 kPa, 0 to 160 psi/0 to 1,100 kPa, 0 to 200 psi/0 to 1,400 kPa, 0 to 300 psi/0 to 2,000 kPa, 0 to 400 psi/0 to 2,800 kPa, 0 to 600 psi/0 to 4,000 kPa, 0 to 1,000 psi/0 to 7,000 kPa, 0 to 2,000 psi/0 to 14,000 kPa	3813K6	000000
				4"	1/4	35 to 140	0 to 210	Glycerin	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 15 psi/0 to 100 kPa, 0 to 30 psi/0 to 200 kPa, 0 to 60 psi/0 to 400 kPa, 0 to 100 psi/0 to 700 kPa, 0 to 160 psi/0 to 1,100 kPa, 0 to 200 psi/0 to 1,400 kPa, 0 to 300 psi/0 to 2,000 kPa, 0 to 400 psi/0 to 2,800 kPa, 0 to 600 psi/0 to 4,000 kPa, 0 to 1,000 psi/0 to 7,000 kPa, 0 to 2,000 psi/0 to 14,000 kPa	3813K7	000000
				4"	1/2	35 to 140	0 to 210	Glycerin	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 15 psi/0 to 100 kPa, 0 to 30 psi/0 to 200 kPa, 0 to 60 psi/0 to 400 kPa, 0 to 100 psi/0 to 700 kPa, 0 to 160 psi/0 to 1,100 kPa, 0 to 200 psi/0 to 1,400 kPa, 0 to 300 psi/0 to 2,000 kPa, 0 to 400 psi/0 to 2,800 kPa, 0 to 600 psi/0 to 4,000 kPa, 0 to 1,000 psi/0 to 7,000 kPa, 0 to 2,000 psi/0 to 14,000 kPa	3813K8	000000

High-Pressure Gauges for Chemicals

A 316 stainless steel guard, also known as an isolator, protects the gauge from damage caused by corrosive chemicals. Gauges are commonly used with pumps, filters, regulators, and in process lines to measure and display pressures up to 2,000 psi.

304 Stainless Steel Case with 316 Stainless Steel Connection—Dual Scale (Pounds per Square Inch, Kilopascals)


	Bottom Connection

			Temp. Range, ° F						Bottom Connection
	Dial Dia.	Pipe Size	Environment	Process	For Use With	Accuracy	Guard Material	Choose a Pressure Range		Each
Any-Angle Mount







				NPT Female

				2 1/2"	1/4	-40 to 140	0 to 210	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 200 psi/0 to 1,400 kPa, 0 to 300 psi/0 to 2,000 kPa, 0 to 400 psi/0 to 2,800 kPa, 0 to 600 psi/0 to 4,000 kPa, 0 to 1,000 psi/0 to 7,000 kPa, 0 to 2,000 psi/0 to 14,000 kPa	3813K3	0000000


				2 1/2"	1/2	-40 to 140	0 to 210	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 200 psi/0 to 1,400 kPa, 0 to 300 psi/0 to 2,000 kPa, 0 to 400 psi/0 to 2,800 kPa, 0 to 600 psi/0 to 4,000 kPa, 0 to 1,000 psi/0 to 7,000 kPa, 0 to 2,000 psi/0 to 14,000 kPa	3813K4	000000
				4"	1/4	-40 to 140	0 to 210	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 200 psi/0 to 1,400 kPa, 0 to 300 psi/0 to 2,000 kPa, 0 to 400 psi/0 to 2,800 kPa, 0 to 600 psi/0 to 4,000 kPa, 0 to 1,000 psi/0 to 7,000 kPa, 0 to 2,000 psi/0 to 14,000 kPa	3813K1	000000
				4"	1/2	-40 to 140	0 to 210	Air Ammonia Boric Acid Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Sodium Hypochlorite (Bleach) Water	±1.6% Full Scale (Not Rated)	316 Stainless Steel	0 to 200 psi/0 to 1,400 kPa, 0 to 300 psi/0 to 2,000 kPa, 0 to 400 psi/0 to 2,800 kPa, 0 to 600 psi/0 to 4,000 kPa, 0 to 1,000 psi/0 to 7,000 kPa, 0 to 2,000 psi/0 to 14,000 kPa	3813K2	000000

Gauge Siphon Tubes


Style A	Style B	Style C	Style D

Also known as pigtails, these siphon tubes protect dry gauges from steam and high-temperature fluids. Add water to the tube to create a protective barrier between your gauge and process media.

NPT Male Connections

Style A

Style B

Style C

Style C—Style C requires less maintenance than Styles A, B, and D because the extra bends prolong water retention.

	Pipe Size	Lg.	Max. Pressure @ Temp.	Specs. Met		Each
Brass



	A	1/4	4"	240 psi @ 400° F	ASTM B43	4031K28	000000


	A	1/4	4"	1,000 psi @ 400° F	ASTM B43	4031K68	00000
	A	1/4	5 5/8"	240 psi @ 400° F	ASTM B43	4031K65	00000
	A	1/4	5 5/8"	1,000 psi @ 400° F	ASTM B43	4031K61	00000
	B	1/4	6 1/2"	240 psi @ 400° F	ASTM B43	4031K66	00000
	B	1/4	6 1/2"	1,000 psi @ 400° F	ASTM B43	4031K63	00000
	C	1/4	7 1/2"	240 psi @ 400° F	ASTM B43	4031K67	00000
	C	1/4	7 1/2"	1,000 psi @ 400° F	ASTM B43	4031K64	00000


	304 Stainless Steel



			A	1/4	5 1/2"	1,500 psi @ 700° F	ASTM A312	4031K26	00000


			A	1/4	5 1/2"	440 psi @ 750° F	ASTM A312	4031K71	00000


			316 Stainless Steel



					A	1/4	5 1/2"	450 psi @ 750° F	ASTM A312	4965K35	00000


					A	1/2	8 7/8"	730 psi @ 800° F	ASTM A312	4965K36	000000
					A	1/2	8 7/8"	1,500 psi @ 800° F	ASTM A312	4965K67	000000
					B	1/4	6 1/2"	450 psi @ 750° F	ASTM A312	4965K37	00000
					B	1/2	10"	730 psi @ 800° F	ASTM A312	4965K38	000000
					C	1/4	7 1/4"	450 psi @ 750° F	ASTM A312	4965K39	00000
					C	1/2	12"	730 psi @ 800° F	ASTM A312	4965K42	000000


					Seamless Steel



							A	1/4	5 1/2"	580 psi @ 750° F	ASTM A106 Grade B	4031K21	00000


							A	1/4	5 1/2"	2,000 psi @ 750° F	ASTM A106 Grade B	4031K51	00000
							A	1/2	8 7/8"	1,000 psi @ 700° F	ASTM A106 Grade B	4031K82	00000
							A	1/2	8 7/8"	1,700 psi @ 800° F	ASTM A106 Grade B	4031K83	00000
							B	1/4	6 1/2"	580 psi @ 750° F	ASTM A106 Grade B	4031K23	00000
							B	1/4	6 1/2"	2,000 psi @ 750° F	ASTM A106 Grade B	4031K53	00000
							C	1/4	7 1/4"	580 psi @ 750° F	ASTM A106 Grade B	4031K24	00000
							C	1/4	7 1/4"	2,000 psi @ 750° F	ASTM A106 Grade B	4031K54	00000


							Welded Steel



									A	1/4	5 1/2"	300 psi @ 400° F	ASTM A53 Type F	4031K11	0000


									C	1/4	7 1/4"	300 psi @ 400° F	ASTM A53 Type F	4031K14	00000

NPT Female × NPT Male Connections

Style D

	Pipe Size	Lg.	Max. Pressure @ Temp.	Specs. Met		Each
Brass



	D	1/4 × 1/4	4"	240 psi @ 400° F	ASTM B43	4031K31	000000


	D	1/4 × 1/4	4"	1,000 psi @ 400° F	ASTM B43	4031K32	00000
	D	1/4 × 1/4	5 1/2"	240 psi @ 400° F	ASTM B43	4031K33	00000
	D	1/4 × 1/4	5 1/2"	1,000 psi @ 400° F	ASTM B43	4031K34	00000