Air Scoops | McMaster-Carr

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39 Products

Air-Release Valves for Oil and Fuel

Use this valve to eliminate air pockets in systems for oil, diesel fuel, gasoline, and kerosene. Valve has a vented relief port to exhaust discharge directly. Body is 304 stainless steel for excellent corrosion resistance.

	Inlet		Relief Port
	Pipe Size	Location	Pipe Size	Type	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Female Inlet and Relief Pipe







				304 Stainless Steel Body—Vertical Mount

				3/4	Bottom	1/2	Pipe	Top	400	-20 to 500	7"	0000000	0000000

Air-Release Valves for Water and Coolant

These valves are often used to remove air pockets in cooling and heating systems to maintain consistent flow and prevent water surges that can damage equipment. All have a vented relief port to exhaust discharge directly.

NPT Female Inlet and Relief Vent

Image of Product. Front orientation. Air Vent Valves. Air-Release Valves for Water and Coolant, Female Inlet.

	Inlet
	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
Brass Body—Vertical Mount



		1/8	Bottom	Top	75	33 to 240	4 3/8"	000000	000000


		1/4	Bottom	Top	150	33 to 240	4 3/8"	000000	00000

NPT Female Inlet, NPT Female Outlet and Relief Vent

Image of Product. Front orientation. Air Vent Valves. Air-Release Valves for Water and Coolant, Female Inlet, Female Outlet.

	Inlet		Outlet
	Pipe Size	Location	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
Brass Body—Vertical Mount



		1/8	Bottom	1/8	Side	Top	75	33 to 240	4 3/8"	000000	000000

NPT Female/Male Inlet and Relief Vent

Valves with female/male inlets have an inlet with both male and female threads, so they can be connected to both male and female adapters and equipment ports.

	Inlet
	Female Pipe Size	Male Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
Brass Body—Vertical Mount



		1/2	3/4	Bottom	Top	150	33 to 240	4 3/4"	000000	000000

NPT Male Inlet and Relief Vent

Image of Product. Top orientation. Air Vent Valves. Air-Release Valves for Water and Coolant, Male Inlet.

	Inlet
	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
Brass Body—Vertical Mount



		1/8	Bottom	Top	50	33 to 240	2 5/8"	0000000	000000


		1/8	Bottom	Top	50	33 to 240	3 3/4"	0000000	00000
		1/8	Bottom	Top	75	33 to 240	4 3/8"	000000	00000
		1/4	Bottom	Top	50	33 to 240	4"	0000000	00000
		1/4	Bottom	Top	150	33 to 240	4 3/4"	000000	00000
		1/2	Bottom	Top	150	33 to 240	3 3/8"	0000000	00000
		3/4	Bottom	Top	150	33 to 240	3 3/8"	0000000	00000
		1	Bottom	Top	150	33 to 240	3 1/2"	0000000	00000

Corrosion-Resistant Remote-Discharge Air-Release Valves for Water

For excellent corrosion resistance in wet conditions and harsh environments, these valves have no metal parts. They eliminate air pockets to maintain consistent flow and prevent water surges that can damage equipment. All have a threaded relief port that can be attached to a drain line for remote discharge.

	Inlet		Relief Port
	Pipe Size	Location	Pipe Size	Type	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Female Inlet and Relief Pipe







				PVC Body—Vertical Mount

				1/2	Bottom	1/2	Pipe	Top	150	32 to 140	3"	00000000	000000


				3/4	Bottom	3/4	Pipe	Top	150	32 to 140	3 1/2"	00000000	00000
				1	Bottom	1	Pipe	Top	150	32 to 140	3 7/8"	00000000	00000
				1 1/4	Bottom	1 1/4	Pipe	Top	150	32 to 140	4 1/2"	00000000	00000
				2	Bottom	2	Pipe	Top	150	32 to 140	5 3/4"	00000000	000000

Air-Release Valves for Drinking Water

Eliminate air pockets in your drinking water system with these valves. They meet NSF/ANSI 61, which designates them as safe to use with drinking water. They have a vented relief port to exhaust discharge directly.

	Inlet		Relief Port
	Pipe Size	Location	Pipe Size	Type	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Female Inlet and Relief Pipe







				Cast Iron Body—Vertical Mount

				1/2	Bottom	1/2	Pipe	Top	300	33 to 225	7"	0000000	0000000


				1	Bottom	1	Pipe	Top	300	33 to 225	9 1/2"	0000000	000000
				2	Bottom	2	Pipe	Top	300	33 to 225	12"	0000000	000000
				3	Bottom	3	Pipe	Top	300	33 to 225	12"	0000000	00000000

Inline Air-Release Valves for Water

Eliminate air pockets without stopping flow—these valves have an internal wire brush that traps air bubbles and discharges them through the top relief port while allowing inline flow from the inlet to the outlet. They are often used to increase efficiency in heating and cooling systems. The vented relief port exhausts discharge directly. Valves have a durable bronze body for a long service life.

	Inlet		Outlet		Relief Port
	Pipe Size	Location	Pipe Size	Location	Type	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.	End-to-End Lg.		Each
NPT Female Inlet, NPT Female Outlet and Relief Vent







				Bronze Body—Vertical Mount

				3/4	Side	3/4	Side	Vent	Top	125	40 to 240	6 15/16"	2 11/16"	0000000	0000000


				1	Side	1	Side	Vent	Top	125	40 to 240	6 1/2"	3 1/8"	0000000	000000

Corrosion-Resistant Air-Release Valves for Water and Coolant

These valves are made of corrosion-resistant materials for use in wet conditions and harsh environments. They eliminate air pockets to maintain consistent flow and prevent water surges that can damage equipment. All have a vented relief port to exhaust discharge directly.

Buna-N Seal—Valve with a Buna-N seal is for use in heating and cooling systems.

EPDM Seal—Valve with an EPDM seal is for use in cooling systems only.

	Inlet		Relief Port
	Pipe Size	Location	Type	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Male Inlet and Relief Vent







				Nylon Body—Vertical Mount—Buna-N Seal

				1/8	Bottom	Vent	Top	90	40 to 180	5 1/4"	00000000	000000




						Nylon Body—Vertical Mount—EPDM Seal

						1/8	Bottom	Vent	Top	90	40 to 212	5 1/4"	00000000	00000

Air-Release Valves for Steam

Our only air-release valves for steam, these seal shut when steam enters the valve to prevent system contents from escaping through the relief port. They are commonly used to eliminate air pockets in steam mains and risers. They exhaust discharge directly through the vented relief port.

		Inlet
	Max. Steam Pressure, psi	Pipe Size	Location	Relief Port Location	Max. Temp., ° F	Overall Ht.		Each
NPT Male Relief Vent







				Brass Body

				15	3/4	Bottom	Top	250	3 1/2"	0000000	000000

Remote-Discharge Air-Release Valves for Water

Unlike valves that release discharge directly, these have a threaded relief port to direct discharge away from your work environment. Often used to increase pump efficiency, they eliminate air pockets in your system to maintain consistent flow and prevent water surges that can damage equipment.

	Inlet		Relief Port
	Pipe Size	Location	Pipe Size	Type	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Female Inlet and Relief Pipe







				Cast Iron Body—Vertical Mount

				3/8	Bottom	3/8	Pipe	Top	150	32 to 150	5 3/4"	00000000	0000000


				1/2	Bottom	3/8	Pipe	Top	150	32 to 150	5 3/4"	00000000	000000
				3/4	Bottom	3/8	Pipe	Top	150	32 to 150	5 3/4"	00000000	000000
				1	Bottom	3/8	Pipe	Top	150	32 to 150	5 3/4"	00000000	000000




						Ductile Iron Body—Vertical Mount

						1/2	Bottom	1/2	Pipe	Top	300	32 to 150	5 1/2"	00000000	000000


						3/4	Bottom	1/2	Pipe	Top	300	32 to 150	5 1/2"	00000000	000000
						1	Bottom	1/2	Pipe	Top	150	32 to 150	9"	00000000	000000
						1	Bottom	1/2	Pipe	Top	300	32 to 150	5 1/2"	00000000	000000
						2	Bottom	1/2	Pipe	Top	150	32 to 150	9"	00000000	000000
						2	Bottom	1/2	Pipe	Top	150	32 to 150	10 1/2"	00000000	000000

Key-Operated Air-Release Valves for Water

Turn the key to manually release air from radiators, heaters, and other hot water equipment. These valves have a vented relief port that exhausts discharge directly. Body is nickel-plated brass for good corrosion resistance.

	Valves									Replacement Keys
	Inlet		Relief Port
	Pipe Size	Location	Type	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each		Each
NPT Male Inlet and Relief Vent







				Nickel-Plated Brass Body—Any-Angle Mount

				1/8	Bottom	Vent	Side	150	33 to 200	1"	0000000	000000	0000000	00000