Pressure Gauge Covers | McMaster-Carr

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15 Products

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

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