Brass Breather Vents | McMaster-Carr

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46 Products

Breather Vents


Style A	Style H

Protect against excess vacuum and pressure in cylinders, gear boxes, enclosures, manifolds, and tanks. You can also use these breather vents to block debris from entering equipment.

Style H—Style H has a Buna-N O-ring for extra protection against leaks.

	Style	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	For Use With	Removes Particle Size Down To, μm		Each
NPT Male







		Zinc-Plated Steel Body and Fitting

		A	2	—	1,095 scfm @ 100 psi	150	300	1 5/8"	Air, Inert Gas	90	0000000	000000




				Nickel-Plated Steel Body and Fitting

				A	1/8	—	2 scfm @ 100 psi	150	300	7/16"	Air, Inert Gas	40	0000000	0000


				A	1/4	—	3 scfm @ 100 psi	150	300	5/8"	Air, Inert Gas	40	0000000	0000
				A	3/8	—	7 scfm @ 100 psi	150	300	3/4"	Air, Inert Gas	40	0000000	0000
				A	1/2	—	17 scfm @ 100 psi	150	300	7/8"	Air, Inert Gas	40	0000000	0000
				A	3/4	—	20 scfm @ 100 psi	150	300	1"	Air, Inert Gas	40	0000000	0000
				A	1	—	28 scfm @ 100 psi	150	300	1 5/16"	Air, Inert Gas	40	0000000	0000
				A	1 1/4	—	50 scfm @ 100 psi	150	300	1 7/16"	Air, Inert Gas	40	0000000	00000
				A	1 1/2	—	73 scfm @ 100 psi	150	300	1 1/2"	Air, Inert Gas	40	0000000	00000




						Brass Body and Fitting

						A	1/16	—	13 scfm @ 100 psi	150	300	1/2"	Air, Inert Gas	90	0000000	0000


						UNF Male







										Brass Body and Fitting

										A	—	10-32	6 scfm @ 100 psi	150	300	3/8"	Air, Inert Gas	90	0000000	0000


										H	—	10-32	1 scfm @ 100 psi	125	200	7/16"	Air, Inert Gas	40	0000000	0000


										BSPT Male







														Zinc-Plated Steel Body and Fitting

														A	1/8	—	26 scfm @ 100 psi	150	300	7/16"	Air, Inert Gas	90	0000000	0000


A														1/4	—	35 scfm @ 100 psi	150	300	11/16"	Air, Inert Gas	90	0000000	0000
A	3/8													—	87 scfm @ 100 psi	150	300	13/16"	Air, Inert Gas	90	0000000	0000
A	1/2													—	131 scfm @ 100 psi	150	300	1"	Air, Inert Gas	90	0000000	0000
A	3/4													—	219 scfm @ 100 psi	150	300	1 1/16"	Air, Inert Gas	90	0000000	0000


NPSM Female







		Zinc-Plated Steel Body and Fitting

		F	1/8											—	26 scfm @ 100 psi	150	300	5/8"	Air, Inert Gas	90	0000000	0000


		F	1/4											—	35 scfm @ 100 psi	150	300	3/4"	Air, Inert Gas	90	0000000	0000
		F	3/8											—	87 scfm @ 100 psi	150	300	15/16"	Air, Inert Gas	90	0000000	0000
		F	1/2											—	131 scfm @ 100 psi	150	300	1"	Air, Inert Gas	90	0000000	0000

Self-Draining Breather Vents

Minimize moisture buildup in enclosures. Also known as drain plugs, these breather vents have a small outlet that allows condensation to drain. They have a silicone O-ring above the threads for a tight seal. Install them at the lowest point of the enclosure. Breather vents meet IP66 for protection in washdown environments. Use them to prevent excess vacuum and pressure in cylinders, gear boxes, and tanks and to block debris from entering equipment.

Threaded NPT Male

Image of Product. Bottom orientation. Breather Vents. Self-Draining Breather Vents.

316 Stainless Steel Body and Fitting—316 stainless steel breather vents have excellent corrosion resistance.

Brass Body and Fitting—Brass breather vents have good corrosion resistance.

	Max. Flow Rate @ Pressure	Max. Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Environment	Hazardous Location Protection Type	Enclosure Rating	Hazardous Location Rating	O-Ring Material	Certification	Features		Each
316 Stainless Steel Body and Fitting



	1/4	Not Rated	Not Rated	320	1 1/16"	11/16"	Air	Corrosive, Dusty, Outdoor, Washdown, Wet	—	IP66, NEMA 4X	—	Silicone Rubber	—	Drain	0000000	000000


	1/2	Not Rated	Not Rated	320	1 1/8"	1"	Air	Corrosive, Dusty, Hazardous, Outdoor, Washdown, Wet	Increased Safety, Protection by Enclosure	IP66, NEMA 4X	ATEX I M2 Ex E I Mb; ATEX II 2 GD Ex E IIC Gb Ex Tb IIIC Db; IEC Zone 1 Groups IIC, IIB, IIA; IEC Zone 21 Groups IIIC, IIIB, IIIA; IECEx Ex E I/IIC Mb/Gb; IECEx Ex IIIC Tb Db	Silicone Rubber	CE Marked	Drain	0000000	00000


	Brass Body and Fitting



			1/4	Not Rated	Not Rated	320	1 1/16"	11/16"	Air	Corrosive, Dusty, Outdoor, Washdown, Wet	—	IP66, NEMA 4X	—	Silicone Rubber	—	Drain	0000000	00000


			1/2	Not Rated	Not Rated	320	1 1/8"	1"	Air	Corrosive, Dusty, Hazardous, Outdoor, Washdown, Wet	Increased Safety, Protection by Enclosure	IP66, NEMA 4X	ATEX I M2 Ex E I Mb; ATEX II 2 GD Ex E IIC Gb Ex Tb IIIC Db; IEC Zone 1 Groups IIC, IIB, IIA; IEC Zone 21 Groups IIIC, IIIB, IIIA; IECEx Ex E I/IIC Mb/Gb; IECEx Ex IIIC Tb Db	Silicone Rubber	CE Marked	Drain	0000000	00000

Submersible Threaded Breather Vents

Use these vents to maintain consistent pressure as temperatures fluctuate by allowing air to flow through sealed enclosures. All have a hydrophobic and oleophobic filter membrane that blocks moisture and contamination from particle buildup.

Metric

Nickel-Plated

Brass

Nickel-Plated Brass—Nickel-plated brass vents stand up to corrosive environments better than nylon and polycarbonate vents. They’re also durable, which means you won’t have to replace them as often.

Head Dia.	Environment	Enclosure Rating	Features		Each







Nickel-Plated Brass

M12	1.5	1/2"	3/4"	Dusty, Submersible, Washdown, Wet	IP66, IP68	Gasket	0000000	000000


M16	1.5	5/8"	3/4"	Dusty, Submersible, Washdown, Wet	IP66, IP68	Gasket	0000000	00000
M20	1.5	13/16"	15/16"	Dusty, Submersible, Washdown, Wet	IP66, IP68	Gasket	0000000	00000

Hazardous-Location Electrical Enclosure Drain Vents

Glass-Filled Nylon

Safe for use around hazardous gasses and dust, these drain vents maintain steady pressure and prevent moisture buildup from temperature changes inside enclosures. They allow air to flow through the enclosures while protecting the contents from washdowns, dirt, and weather. Install these drain vents at the lowest point on an enclosure, so moisture can drip out.

Increased Safety—Increased-safety drain vents keep sparks, high temperatures, or current creepage inside an enclosure, so they won’t ignite flammable gasses and dust.

Glass-Filled Nylon—Glass-filled nylon drain vents are lightweight yet durable. They’re good for most areas.

	Nut Material	O-Ring Material	Color	Max. Temp., ° F	Hazardous Location Rating		Each
Increased-Safety Drain Vents







	Glass-Filled Nylon

	M20 × 1.5 mm	1 1/4"	NEMA 4X, IP66	Brass	Buna-N	Black	185	ATEX II 2DG IECEx Ex Tb IIIC Db IECEx Exe II Gb NEC Class I Division 2 Groups A, B, C, D	0000000	000000

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

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

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

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