Brass Vent Caps | McMaster-Carr

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	Body Material Body Material

Iron

Brass

	Screen Material Screen Material

Brass

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

Metric

UNF

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Connection Style Connection Style

	Threaded

	For Use With For Use With

Air

Inert Gas

	Gender Gender


Female	Male

	Fitting Material Fitting Material

Iron

Brass

	Drive Style Drive Style

External Hex

Hex

	Height Height

	Maximum Flow Rate Maximum Flow Rate

	Environment Environment

	Hex Size Hex Size

5/16"

3/8"

10 mm

	Removes Particle Size Down To Removes Particle Size Down To

40 microns

90 microns

1,190 microns

	Connection Type Connection Type

	Pipe

	Filter Material Filter Material

Bronze

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Material Material

Brass

	Maximum Pressure Maximum Pressure

125 psi

150 psi

Not Rated

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

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12 Products

About Noise, Filtration, and Flow Ratings

Weather-Resistant Breather Vents

Shield outdoor pipe and tank openings from the environment. Also known as vent caps, these breather vents have screens to allow air flow while blocking debris. Use them to prevent excess vacuum and pressure in your equipment.

Style C has two outlets for greater flow.

For technical drawings and 3-D models, click on a part number.

					Screen
Style	Pipe Size	Ht.	Lg.	For Use With	Material	Construction	Mesh Size	Removes Particle Size Down To, microns		Each
NPT Female
Iron Body and Fitting
C	3/4	1 1/2"	4 11/16"	Air	Brass	Wire Mesh	16	1,190	0000000	000000
C	1	1 1/2"	4 11/16"	Air	Brass	Wire Mesh	16	1,190	0000000	00000
C	1 1/2	1 7/8"	7 11/16"	Air	Brass	Wire Mesh	16	1,190	0000000	00000
C	1 1/4	1 7/8"	7 11/16"	Air	Brass	Wire Mesh	16	1,190	0000000	00000

Breather Vents

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

For technical drawings and 3-D models, click on a part number.

NPT Male
Style	Pipe Size	Thread Size	Max. Flow Rate	Max. Pressure, psi	Max. Temp., °F	Ht.	For Use With	Removes Particle Size Down To, microns		Each
Brass Body and Fitting
A	1/16	__	13 scfm @ 100 psi	150	300°	1/2"	Air, Inert Gas	90	0000000	00000
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

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.

Brass breather vents have good corrosion resistance.

For technical drawings and 3-D models, click on a part number.

NPT Male
Pipe Size	Max. Temp., °F	Ht.	Dia.	For Use With	Environmental Rating		Each
Brass Body and Fitting
1/2	320°	15/16"	1"	Air	IEC Zone 1 Groups IIC, IIB, IIA, IEC Zone 21 Groups IIIC, IIIB, IIIA, IP66, NEMA 4X	0000000	000000
1/4	320°	15/16"	11/16"	Air	IP66, NEMA 4X	0000000	00000

Submersible Threaded Breather Vents

Nickel-Plated Brass

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.

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.

For technical drawings and 3-D models, click on a part number.

Metric
Thread Size	Thread Pitch, mm	For Hole Dia.	Head Dia.	Environment	Environmental Rating	Features		Each
Nickel-Plated Brass
M12	1.5	1/2"	3/4"	Damp, Dusty, Submersible, Washdown	IP68, IP66	Gasket	0000000	000000
M16	1.5	5/8"	3/4"	Damp, Dusty, Submersible, Washdown	IP68, IP66	Gasket	0000000	00000
M20	1.5	13/16"	15/16"	Damp, Dusty, Submersible, Washdown	IP68, IP66	Gasket	0000000	00000