Air Scoops | McMaster-Carr

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2B999

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39 Products

Air-Release Valves for Water and Coolant

With Female Inlet

With Female Inlet
and Female
Outlet

With Female/Male or Male Inlet

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.

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.

NPT Female Inlet and Relief Vent

Inlet
Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temperature 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

Inlet		Outlet
Pipe Size	Location	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temperature 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

Inlet
Female Pipe Size	Male Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temperature 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

Inlet
Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temperature 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 Air-Release Valves for Water and Coolant

Max. Pressure: 90 psi
Temperature Range: See table

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.

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

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

Inlet
Pipe Size	Location	Relief Port Location	Temperature Range, °F	Overall Ht.		Each
NPT Male Inlet and Relief Vent
Nylon Body—Buna-N Seal
1/8	Bottom	Top	40° to 180°	5 1/4"	00000000	000000
Nylon Body—EPDM Seal
1/8	Bottom	Top	40° to 212°	5 1/4"	00000000	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	Location	Max. Pressure, psi	Temperature Range, °F	Overall Ht.		Each
NPT Female Inlet and Relief Port
PVC Body
1/2	Bottom	1/2	Top	150	32° to 140°	3"	00000000	000000
3/4	Bottom	3/4	Top	150	32° to 140°	3 1/2"	00000000	00000
1	Bottom	1	Top	150	32° to 140°	3 7/8"	00000000	00000
1 1/4	Bottom	1 1/4	Top	150	32° to 140°	4 1/2"	00000000	00000
2	Bottom	2	Top	150	32° to 140°	5 3/4"	00000000	000000

Remote-Discharge Air-Release Valves for Water

Max. Pressure: See table
Temperature Range: 32° to 150° F

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	Location	Max. Pressure, psi	Overall Ht.		Each
NPT Female Inlet and Relief Port
Cast Iron Body
3/8	Bottom	3/8	Top	150	5 3/4"	00000000	0000000
1/2	Bottom	3/8	Top	150	5 3/4"	00000000	000000
3/4	Bottom	3/8	Top	150	5 3/4"	00000000	000000
1	Bottom	3/8	Top	150	5 3/4"	00000000	000000
Ductile Iron Body
1/2	Bottom	1/2	Top	300	5 1/2"	00000000	000000
3/4	Bottom	1/2	Top	300	5 1/2"	00000000	000000
1	Bottom	1/2	Top	150	9"	00000000	000000
1	Bottom	1/2	Top	300	5 1/2"	00000000	000000
2	Bottom	1/2	Top	150	9"	00000000	000000
2	Bottom	1/2	Top	150	10 1/2"	00000000	000000

Inline Air-Release Valves for Water

Max. Pressure: 125 psi
Temperature Range: 40° to 240° F

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	Connection Type	Location	Overall Ht.	End-to-End Lg.		Each
NPT Female Inlet and Outlet
Bronze Body
3/4	Side	3/4	Side	Vent	Top	6 15/16"	2 11/16"	0000000	0000000
1	Side	1	Side	Vent	Top	6 1/2"	3 1/8"	0000000	000000

Key-Operated Air-Release Valves for Water

Max. Pressure: 150 psi
Temperature Range: 33° to 200° F

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.

Valve
Inlet						Replacement Key
Pipe Size	Location	Relief Port Location	Overall Ht.		Each		Each
NPT Male Inlet and Relief Vent
Nickel-Plated Brass Body
1/8	Bottom	Side	1"	0000000	000000	0000000	00000

Air-Release Valves for Drinking Water

Max. Pressure: 300 psi
Temperature Range: 33° to 225° F

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	Location	Overall Ht.		Each
NPT Female Inlet and Relief Port
Cast Iron Body
1/2	Bottom	1/2	Top	7"	0000000	0000000
1	Bottom	1	Top	9 1/2"	0000000	000000
2	Bottom	2	Top	12"	0000000	000000
3	Bottom	3	Top	12"	0000000	00000000

Air-Release Valves for Oil and Fuel

Max. Pressure: 400 psi
Temperature Range: -20° to 500° F

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	Location	Overall Ht.		Each
NPT Female Inlet and Relief Port
304 Stainless Steel Body
3/4	Bottom	1/2	Top	7"	0000000	0000000

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	Temperature Range, °F	Overall Ht.		Each
NPT Male Inlet and Relief Vent
Brass Body
15	3/4	Bottom	Top	--° to 250°	3 1/2"	0000000	000000