Vents for Oil | McMaster-Carr

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51 Products

Breather Vents


Style B	Style C	Style D	Style E

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.

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.

	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

	D	1/8	Not Rated	Not Rated	225	1"	—	Air, Inert Gas, Oil, Water	40	—	2257K11	000000


	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




			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

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	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	Top	400	-20 to 500	7"	8126K12	0000000

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

Compact Pressure-Relief Valves

Due to their small size, these valves are often installed on tanks in low-clearance areas. They begin opening at the set pressure. Nylon valves fully open at about 10% over the set pressure and steel valves fully open at about 50% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. All have a vent outlet to exhaust discharge directly. Set pressure is not adjustable.

Steel Body—For Grease and Oil

	Inlet							Each
	Pipe Size	Location	Max. Pressure, psi	Relief Port Location	Overall Ht.	Set Pressure		1-9	10-Up
NPTF Male Inlet and Relief Vent



		1/8	Bottom	5	Top	1/2"	1 psi	1093K1	00000	00000


		1/8	Bottom	15	Top	1/2"	7.5 psi	1093K2	0000	0000
		1/8	Bottom	25	Top	1/2"	15 psi	1093K3	0000	0000
		1/8	Bottom	80	Top	17/32"	45 psi	1093K4	0000	0000
		1/8	Bottom	140	Top	9/16"	80 psi	1093K53	0000	0000
		1/8	Bottom	200	Top	1/2"	100 psi	1093K64	0000	0000
		1/8	Bottom	650	Top	1/2"	400 psi	1093K65	0000	0000


		BSPT Male Inlet and Relief Vent



				1/8	Bottom	1	Top	1/2"	0.3 psi	1093K61	0000	0000


				1/8	Bottom	5	Top	1/2"	1 psi	1093K62	0000	0000
				1/8	Bottom	80	Top	1/2"	45 psi	1093K63	0000	0000

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

Pressure-Relief Valves for Oil

These valves are often used in hydraulic and lubrication systems. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Adjust the set pressure within the range.

NPT Male Inlet and NPT Female Relief Port

Image of Product. Front orientation. Pressure-Relief Valves. Pressure-Relief Valves for Oil.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Set Pressure Adjustment Method	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Valve Type	Choose a Set Pressure, psi		Each







			Bronze Body—316 Stainless Steel Seal

			1/2	Bottom	1,400	3/4	Side	External Adjustment Screw	90° Elbow	7 1/4"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600 , 600 to 900	4460K81	0000000


			3/4	Bottom	1,400	3/4	Side	External Adjustment Screw	90° Elbow	7 1/4"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300	4460K82	000000
			1	Bottom	1,400	1	Side	External Adjustment Screw	90° Elbow	7 1/2"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600 , 600 to 900	4460K83	000000
			1 1/4	Bottom	1,400	1 1/4	Side	External Adjustment Screw	90° Elbow	8"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600 , 600 to 900	4460K84	000000
			1 1/2	Bottom	1,400	1 1/2	Side	External Adjustment Screw	90° Elbow	8 7/8"	Oil	-320 to 420	Relief	15 to 75 , 50 to 150 , 100 to 300 , 200 to 600	4460K85	00000000