Gear Box Breathers | McMaster-Carr

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115 Products

Breather Vents


Style A	Style B	Style C	Style D

Style E	Style G	Style F	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 G—Style G has a slotted drive for installation with a screwdriver.

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

Splash Guard—Breather vents with splash guard are good for containers that are often filled and drained; they have a guard that prevents oil from splashing out of the vent hole.

	Style	Pipe Size	Thread Size	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	Dia.	For Use With	Removes Particle Size Down To, μm	Features		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	—	9833K16	000000


				D	1/8	—	Not Rated	Not Rated	225	1"	—	Air, Inert Gas, Oil, Water	40	—	2257K11	00000
				D	1/4	—	Not Rated	Not Rated	225	1"	—	Air, Inert Gas, Oil, Water	40	—	2257K12	00000
				D	3/8	—	Not Rated	Not Rated	225	1 1/16"	—	Air, Inert Gas, Oil, Water	40	—	2257K13	00000
				D	1/2	—	Not Rated	Not Rated	225	1 3/16"	—	Air, Inert Gas, Oil, Water	40	—	2257K14	00000
				D	3/4	—	Not Rated	Not Rated	225	1 1/4"	—	Air, Inert Gas, Oil, Water	40	—	2257K15	00000
				E	1/8	—	Not Rated	Not Rated	225	1 3/16"	—	Air, Inert Gas, Oil, Water	40	Splash Guard	2257K31	00000
				E	1/4	—	Not Rated	Not Rated	225	1 3/16"	—	Air, Inert Gas, Oil, Water	40	Splash Guard	2257K32	00000
				E	3/8	—	Not Rated	Not Rated	225	1 1/4"	—	Air, Inert Gas, Oil, Water	40	Splash Guard	2257K33	00000
				E	1/2	—	Not Rated	Not Rated	225	1 5/16"	—	Air, Inert Gas, Oil, Water	40	Splash Guard	2257K34	00000
				E	3/4	—	Not Rated	Not Rated	225	1 3/8"	—	Air, Inert Gas, Oil, Water	40	Splash Guard	2257K35	00000




						Nickel-Plated Steel Body and Fitting

						A	1/8	—	2 scfm @ 100 psi	150	300	7/16"	—	Air, Inert Gas	40	—	9833K21	0000


						A	1/4	—	3 scfm @ 100 psi	150	300	5/8"	—	Air, Inert Gas	40	—	9833K22	0000
						A	3/8	—	7 scfm @ 100 psi	150	300	3/4"	—	Air, Inert Gas	40	—	9833K23	0000
						A	1/2	—	17 scfm @ 100 psi	150	300	7/8"	—	Air, Inert Gas	40	—	9833K11	0000
						A	3/4	—	20 scfm @ 100 psi	150	300	1"	—	Air, Inert Gas	40	—	9833K12	0000
						A	1	—	28 scfm @ 100 psi	150	300	1 5/16"	—	Air, Inert Gas	40	—	9833K13	0000
						A	1 1/4	—	50 scfm @ 100 psi	150	300	1 7/16"	—	Air, Inert Gas	40	—	9833K14	00000
						A	1 1/2	—	73 scfm @ 100 psi	150	300	1 1/2"	—	Air, Inert Gas	40	—	9833K15	00000




								Brass Body and Fitting

								A	1/16	—	13 scfm @ 100 psi	150	300	1/2"	—	Air, Inert Gas	90	—	9833K19	0000




										Steel Body and Fitting

										B	1/8	—	Not Rated	125	400	3/4"	—	Oil	—	Splash Guard	8631T11	0000


										B	3/8	—	Not Rated	125	400	1"	—	Oil	—	Splash Guard	8631T12	0000
										B	1/2	—	Not Rated	125	400	1 1/8"	—	Oil	—	Splash Guard	8631T13	00000




												Nylon Body and Fitting

												C	1/4	—	Not Rated	Not Rated	210	1 9/16"	1 11/16"	Air, Oil	40	Splash Guard	8631T21	0000


C	3/8											—	Not Rated	Not Rated	210	1 3/4"	1 11/16"	Air, Oil	40	Splash Guard	8631T22	0000
C	1/2											—	Not Rated	Not Rated	210	1 13/16"	1 11/16"	Air, Oil	40	Splash Guard	8631T23	0000
C	3/4											—	Not Rated	Not Rated	210	1 13/16"	1 11/16"	Air, Oil	40	Splash Guard	8631T24	0000


UNF Male







												316 Stainless Steel Body and Fitting

												G	—	10-32	10 scfm @ 100 psi	100	750	7/16"	3/16"	Air, Inert Gas	10	—	8584T31	00000




														Brass Body and Fitting

														A	—	10-32	6 scfm @ 100 psi	150	300	3/8"	—	Air, Inert Gas	90	—	9833K18	0000


				H	—									10-32	1 scfm @ 100 psi	125	200	7/16"	—	Air, Inert Gas	40	—	8556T24	0000


				UNC Male







																316 Stainless Steel Body and Fitting

																G	—	5/16"-18	25 scfm @ 100 psi	100	750	1 7/16"	5/16"	Air, Inert Gas	10	—	8584T32	00000


						G										—	3/8"-16	50 scfm @ 100 psi	100	750	1"	3/8"	Air, Inert Gas	10	—	8584T33	00000


						BSPT Male







																Zinc-Plated Steel Body and Fitting

																A	1/8	—	26 scfm @ 100 psi	150	300	7/16"	—	Air, Inert Gas	90	—	9847K11	0000


																A	1/4	—	35 scfm @ 100 psi	150	300	11/16"	—	Air, Inert Gas	90	—	9847K12	0000
																A	3/8	—	87 scfm @ 100 psi	150	300	13/16"	—	Air, Inert Gas	90	—	9847K13	0000
																A	1/2	—	131 scfm @ 100 psi	150	300	1"	—	Air, Inert Gas	90	—	9847K14	0000
										A						3/4	—	219 scfm @ 100 psi	150	300	1 1/16"	—	Air, Inert Gas	90	—	9847K15	0000


										NPSM Female







	Zinc-Plated Steel Body and Fitting

	F																1/8	—	26 scfm @ 100 psi	150	300	5/8"	—	Air, Inert Gas	90	—	9833K24	0000


	F	1/4															—	35 scfm @ 100 psi	150	300	3/4"	—	Air, Inert Gas	90	—	9833K25	0000
	F	3/8	—														87 scfm @ 100 psi	150	300	15/16"	—	Air, Inert Gas	90	—	9833K26	0000
	F	1/2	—														131 scfm @ 100 psi	150	300	1"	—	Air, Inert Gas	90	—	9833K27	0000

Washdown Weather Resistant Breather Vents

These breather vents are rated NEMA 6 to withstand periodic submersion in water. Install them in enclosures to stop the buildup of pressure and vacuum and to prevent debris from entering equipment. Breather vents can be used with enclosures that are rated NEMA 4, 12, and 13 for washdown environments and splashing oil and coolant.

Threaded UNF Male

Aluminum

Body

	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	Dia.	For Use With	Environment	Enclosure Rating	O-Ring Material	Removes Particle Size Down To, μm		Each
Aluminum Body and Fitting



	10-32	Not Rated	1.4	158	1/4"	3/8"	Air	Dusty, Outdoor, Submersible, Washdown, Wet	NEMA 6	EPDM	3	1226T15	000000

Threaded Metric Male


303 Stainless Steel Body	Aluminum Body	Nylon Body	Polycarbonate Body

	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	Dia.	For Use With	Environment	Enclosure Rating	O-Ring Material	Removes Particle Size Down To, μm	Features		Each
303 Stainless Steel Body and Fitting



	M3	Not Rated	1.4	158	5/16"	1/4"	Air	Dusty, Outdoor, Submersible, Washdown, Wet	NEMA 6	EPDM	3	—	1226T13	000000


	Nylon Body and Fitting



			M3	Not Rated	1.4	158	3/8"	5/16"	Air	Dusty, Outdoor, Submersible, Washdown, Wet	NEMA 6	—	3	—	1226T11	00000


			Polycarbonate Body and Fitting



					M16	Not Rated	1.4	158	15/16"	1 1/16"	Air	Dusty, Outdoor, Submersible, Washdown, Wet	NEMA 6	Buna-N	3	Mounting Nut	1226T12	00000


					Aluminum Body and Fitting



							M8	Not Rated	1.4	158	9/16"	9/16"	Air	Dusty, Outdoor, Submersible, Washdown, Wet	NEMA 6	EPDM	3	—	1226T14	00000


							M20	Not Rated	1.4	158	1"	1 1/8"	Air	Dusty, Outdoor, Submersible, Washdown, Wet	NEMA 6	EPDM	1	—	1226T17	00000

Barbed Male

ABS Body

Vents with barbed connections fit unthreaded openings and are held in place by friction.

	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	Dia.	For Use With	Environment	Enclosure Rating	O-Ring Material	Removes Particle Size Down To, μm		Each
ABS Body and Fitting



	21/64"	Not Rated	4	158	9/16"	7/8"	Air	Dusty, Outdoor, Submersible, Washdown, Wet	NEMA 6	Silicone Rubber	1	1226T16	00000

Corrosion Resistant Breather Vents

These breather vents withstand corrosion in damp 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


304 Stainless Steel	Polyethylene

Polyethylene Body and Fitting—Polyethylene breather vents can be cleaned with mineral spirits.

304 Stainless Steel Body and Fitting—Stainless steel breather vents stand up to higher temperatures than polyethylene breather vents.

	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	Dia.	For Use With	Removes Particle Size Down To, μm		Each
Polyethylene Body and Fitting



	1/8	1 scfm @ 100 psi	100	150	7/16"	1/2"	Air, Inert Gas	100	4471K11	00000


	1/4	3 scfm @ 100 psi	100	150	1/2"	11/16"	Air, Inert Gas	100	4471K12	0000
	3/8	9 scfm @ 100 psi	100	150	11/16"	15/16"	Air, Inert Gas	100	4471K13	0000
	1/2	10 scfm @ 100 psi	100	150	11/16"	15/16"	Air, Inert Gas	100	4471K14	0000
	3/4	20 scfm @ 100 psi	100	150	1 1/8"	1 1/2"	Air, Inert Gas	100	4471K15	0000
	1	22 scfm @ 100 psi	100	150	1 3/8"	1 7/8"	Air, Inert Gas	100	4471K16	0000


	304 Stainless Steel Body and Fitting



			1/8	26 scfm @ 100 psi	150	400	1/2"	—	Air, Inert Gas	100	4456K11	0000


			1/4	35 scfm @ 100 psi	150	400	11/16"	—	Air, Inert Gas	100	4456K12	00000
			3/8	87 scfm @ 100 psi	150	400	13/16"	—	Air, Inert Gas	100	4456K13	00000
			1/2	131 scfm @ 100 psi	150	400	15/16"	—	Air, Inert Gas	100	4456K14	00000
			3/4	219 scfm @ 100 psi	150	400	15/16"	—	Air, Inert Gas	100	4456K15	00000
			1	306 scfm @ 100 psi	150	400	1 3/16"	—	Air, Inert Gas	100	4456K16	00000

Threaded UNF Male


303 Stainless Steel	316 Stainless Steel

303 Stainless Steel Body and Fitting—Stainless steel breather vents stand up to higher temperatures than polyethylene breather vents.

316 Stainless Steel Body and Fitting—316 stainless steel breather vents resist corrosion better than 303 and 304 stainless steel breather vents and stand up to higher temperatures than polyethylene breather vents.

Viton® Fluoroelastomer O-Ring—Those with a Viton® Fluoroelastomer O-ring offer extra protection against leaks.

	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	For Use With	O-Ring Material	Removes Particle Size Down To, μm		Each
303 Stainless Steel Body and Fitting



	10-32	Not Rated	250	400	7/16"	Air, Inert Gas	Viton® Fluoroelastomer	40	8556T25	000000


	316 Stainless Steel Body and Fitting



			10-32	Not Rated	250	400	7/16"	Air, Inert Gas	Viton® Fluoroelastomer	40	8556T26	00000

Threaded Metric Male

316 Stainless

Steel

Viton® Fluoroelastomer O-Ring—Those with a Viton® Fluoroelastomer O-ring offer extra protection against leaks.

	Max. Flow Rate @ Pressure	Max. Pressure, psi	Max. Temp., ° F	Ht.	For Use With	O-Ring Material	Removes Particle Size Down To, μm		Each
316 Stainless Steel Body and Fitting



	M5	Not Rated	250	400	7/16"	Air, Inert Gas	Viton® Fluoroelastomer	40	8556T27	000000

Weather Resistant Breather Vents


Threaded NPT Male, Style A	Threaded NPT Female, Style B	Slip On Female Style C

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.

Threaded NPT Male

Style A

									Screen
	Style	Pipe Size	Max. Flow Rate @ Pressure	Max. Pressure	Max. Temp.	Ht.	Dia.	For Use With	Material	Construction	Mesh Size	Removes Particle Size Down To, μm		Each
Zinc-Plated Steel Body and Fitting



		A	3/8	Not Rated	Not Rated	Not Rated	1 1/4"	1 1/4"	Air	304 Stainless Steel	Wire Mesh	100 × 100	140	36635K38	000000


		A	1/2	Not Rated	Not Rated	Not Rated	1 7/16"	1 1/4"	Air	304 Stainless Steel	Wire Mesh	100 × 100	140	36635K39	00000

Threaded NPT Female

Style B

									Screen
	Style	Pipe Size	Max. Flow Rate @ Pressure	Max. Pressure	Max. Temp.	Ht.	Dia.	For Use With	Material	Construction	Mesh Size	Removes Particle Size Down To, μm		Each
Zinc-Plated Iron Body and Fitting



		B	3/4	Not Rated	Not Rated	Not Rated	1 3/16"	1 13/16"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	36635K41	000000


		B	1	Not Rated	Not Rated	Not Rated	1 5/16"	2 1/4"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	36635K42	00000
		B	1 1/4	Not Rated	Not Rated	Not Rated	1 3/8"	2 3/4"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	36635K43	00000
		B	1 1/2	Not Rated	Not Rated	Not Rated	1 1/2"	3 1/8"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	36635K44	00000
		B	2	Not Rated	Not Rated	Not Rated	1 11/16"	3 7/8"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	36635K45	00000
		B	3	Not Rated	Not Rated	Not Rated	2 1/2"	5 1/2"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	36635K46	00000
		B	4	Not Rated	Not Rated	Not Rated	2 1/2"	6 1/2"	Air	304 Stainless Steel	Wire Mesh	20 × 20	864	36635K47	000000

Slip On Female

Style C

Style C—Style C has a set screw to secure in place.

									Screen
	Style	Pipe Size	Max. Flow Rate @ Pressure	Max. Pressure	Max. Temp.	Ht.	Dia.	For Use With	Material	Construction	Screen Opening Size	Features		Each
Zinc-Plated Steel Body and Fitting



		C	1	Not Rated	Not Rated	Not Rated	1 1/2"	2 1/2"	Air	Steel	Perforated	1/8"	Set Screw	36635K51	00000


		C	1 1/4	Not Rated	Not Rated	Not Rated	1 1/2"	2 1/2"	Air	Steel	Perforated	1/8"	Set Screw	36635K52	0000
		C	1 1/2	Not Rated	Not Rated	Not Rated	1 3/4"	2 3/4"	Air	Steel	Perforated	1/8"	Set Screw	36635K53	0000
		C	2	Not Rated	Not Rated	Not Rated	2 3/4"	4"	Air	Steel	Perforated	1/8"	Set Screw	36635K54	00000

Moisture Absorbing Breather Vents

Keep moisture, dirt, and debris from entering your oil reservoirs. The silica gel inside these breather vents absorbs moisture from the air, preventing rust from forming inside your tanks. The gel changes from blue to pink as it becomes saturated, letting you know it needs to be replaced. A second filter blocks dust and other particles from getting inside. These breather vents allow air to flow in and out of your lubrication system, keeping excess vacuum or pressure from building up in cylinders, gear boxes, and tanks.

Nylon and Polycarbonate Body—NPT Male

Breather vents with a plastic body are clear, so a quick glance will tell you if the gel is saturated. Unlike steel versions, which can be rebuilt, the entire unit must be replaced when fresh gel is needed.

	For Tank Cap., gal.	Max. Flow Rate @ Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Removes Particle Size Down To, μm		Each
Nylon and Polycarbonate Body with Nylon Fitting



	3/8	1 to 2	4.5 scfm @ 1 psi	200	4"	2 1/2"	Air, Inert Gas	3	3297T72	000000


	3/8	1 to 5	4 scfm @ 1 psi	200	5 3/8"	2 1/2"	Air, Inert Gas	3	3297T71	00000
	1	5 to 200	16 scfm @ 1 psi	200	6 1/8"	4 1/8"	Air, Inert Gas	3	3297T31	00000
	1	5 to 350	16 scfm @ 1 psi	200	8 1/8"	4 1/8"	Air, Inert Gas	3	3297T33	000000
	1	5 to 500	16 scfm @ 1 psi	200	10 1/8"	4 1/8"	Air, Inert Gas	3	3297T35	000000

Nylon and Polycarbonate Body with Check Valves—NPT Female

Image of Product. Front orientation. Contains Inset. Breather Vents. Moisture Absorbing Breather Vents, NPT Thread, Polycarbonate Body, Nylon Body, Female.

For washdown environments, select breather vents with check valves. These valves allow air to flow in and out, but close when liquids try to enter.

	For Tank Cap., gal.	Max. Flow Rate @ Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Removes Particle Size Down To, μm		Each
Nylon and Polycarbonate Body with Nylon Fitting



	1	1 to 400	27 scfm @ 1 psi	200	4 11/16"	5 11/16"	Air, Inert Gas	3	3297T73	0000000


	1	1 to 600	26 scfm @ 1 psi	200	6 7/16"	5 11/16"	Air, Inert Gas	3	3297T74	000000
	1	1 to 800	25 scfm @ 1 psi	200	8 1/4"	5 11/16"	Air, Inert Gas	3	3297T75	000000
	1	1 to 1,000	24 scfm @ 1 psi	200	10"	5 11/16"	Air, Inert Gas	3	3297T76	000000

Steel Body—NPT Male


	Repair Kits

For an extended service life, use breather vents with a steel body. They are stronger than breather vents with plastic bodies and hold up better when exposed to chemicals. A window lets you check the color of the gel.

Repair Kits—No need to replace the entire unit when the gel is saturated—use rebuild kits to add fresh gel and to replace the window, filters, and gaskets.

	Vents										Repair Kits
	Pipe Size	For Tank Cap., gal.	Max. Flow Rate @ Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Removes Particle Size Down To, μm		Each		Each
Steel Body



		2	1 to 800	85 scfm @ 1 psi	220	11 1/2"	10 1/8"	Air	1	3297T77	000000000	3297T771	0000000


		2	1 to 1,300	85 scfm @ 1 psi	220	13 3/4"	10 1/8"	Air	1	3297T78	00000000	3297T781	000000
		2	1 to 2,400	80 scfm @ 1 psi	220	18 1/4"	10 1/8"	Air	1	3297T79	00000000	3297T791	000000
		3	1 to 4,000	205 scfm @ 1 psi	220	19 1/4"	15 1/2"	Air	1	3297T81	00000000	3297T811	000000

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	8602T31	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	8602T32	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	8602T11	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	8602T12	00000

Lockable Breather Vents with Cap

Secure access to vented openings in pipe and tanks—the cap can be locked to prevent tampering. These breather vents allow you to add a filling port to your hydraulic tank while protecting against excess pressure and vacuum. Use them to stop debris from entering your tank. Breather vents mount on top of standard tank openings with included hardware. Padlock is not included.

Flange Mount


Steel with 304 Stainless Steel Screen	Steel with Nylon Plastic Screen

	Max. Pressure	Ht.	For Use With	Cap Material	Screen Material	No. of Bolt Holes	Bolts Included	Removes Particle Size Down To, μm	For Max. Padlock Shackle Dia.		Each
Steel Body



	2 1/8"	Not Rated	5 1/8"	Air, Oil	Steel	304 Stainless Steel	6	Yes	10	3/8"	3853N13	000000


	2 1/8"	Not Rated	5 1/8"	Air, Oil	Steel	304 Stainless Steel	6	Yes	40	3/8"	4473K45	00000
	2 1/8"	Not Rated	6 1/8"	Air, Oil	Steel	Nylon	6	Yes	10	3/8"	3853N12	00000
	2 1/8"	Not Rated	6 1/8"	Air, Oil	Steel	Nylon	6	Yes	40	3/8"	3853N11	00000

Threaded NPT Male

Aluminum Body

	Max. Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Cap Material	Screen Material	For Max. Padlock Shackle Dia.		Each
Aluminum Body and Fitting



	2	Not Rated	200	4 1/2"	5 5/8"	Air, Oil, Water	Aluminum	Stainless Steel	3/8"	4906K11	000000

Breather Vents with Cap


Style A	Style B	Style C	Style D	Replacement Screen

Add a filling port to your hydraulic tank while protecting against excess pressure and vacuum. Breather vents stop debris from entering your tank. Mount them on top of standard tank openings with included hardware.

Style A


	Replacement Screen

	Vents												Replacement Screens
	For Opening Dia.	Max. Flow Rate, gpm	Max. Temp., ° F	Ht.	For Use With	Screen Material	Mount Type	No. of Bolt Holes	Bolts Included	Removes Particle Size Down To, μm		Each		Each
Steel Body







				304 Stainless Steel Cap

				2 1/8"	20	220	5"	Air, Oil	304 Stainless Steel	Flange	6	Yes	40	4473K21	000000	4473K32	000000




						Steel Cap

						2 1/8"	192	250	5 1/8"	Air, Oil	304 Stainless Steel	Flange	6	Yes	40	4473K22	00000	4473K33	0000

Style B

	Ht.	For Use With	Screen Material	Mount Type	No. of Bolt Holes	Bolts Included	Removes Particle Size Down To, μm		Each
Nylon Body







	Nylon Cap

	2"	Not Rated	195	5 3/4"	Air, Oil	Nylon	Flange	6	Yes	40	4473K42	000000

Style C


	Replacement Screen

	Vents												Replacement Screens
	For Opening Dia.	Max. Flow Rate, gpm	Max. Temp., ° F	Ht.	For Use With	Screen Material	Mount Type	No. of Bolt Holes	Bolts Included	Removes Particle Size Down To, μm		Each		Each
Steel Body







				304 Stainless Steel Cap

				2 1/8"	20	220	5 3/4"	Air, Oil	Nylon	Flange	6	Yes	40	4473K14	000000	4473K31	000000




						Steel Cap

						2 1/8"	115	Not Rated	5 1/8"	Air, Oil	304 Stainless Steel	Flange	6	Yes	10	4473K152	00000	4473K33	0000


						2 1/8"	115	Not Rated	6 1/8"	Air, Oil	Nylon	Flange	6	Yes	10	4473K151	00000	4473K149	0000
						2 1/8"	190	150	6 1/8"	Air, Oil	Nylon	Flange	6	Yes	40	4473K53	00000	4473K149	0000

Style D


	Replacement Screen

	Vents															Replacement Screens
	For Opening Ht.	For Opening Wd.	Max. Flow Rate, gpm	Max. Temp.	Ht.	Wd.	Dp.	For Use With	Screen Material	Mount Type	No. of Bolt Holes	Bolts Included	Removes Particle Size Down To, μm		Each		Each
Nylon Body







				Steel Cap

				3 1/2"	3"	115	Not Rated	6 1/8"	4 5/8"	4"	Air, Oil	304 Stainless Steel	Flange	7	Yes	10	4473K154	000000	4473K33	00000


				3 1/2"	3"	192	Not Rated	6 1/8"	4 5/8"	4"	Air, Oil	304 Stainless Steel	Flange	7	Yes	40	4473K153	00000	4473K33	0000