Gas Caps | McMaster-Carr

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Removes Particle Size Down To

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For Gas Cylinder Pressure Rating

17 Products

Diesel Fuel Tank Caps


	Fuel Caps with Vent

Often used with trailers, compressors, and other equipment tanks, these caps meet Department of Transportation requirements. Caps have fusible plugs that will melt when the outside environment reaches their opening temperature.

Fuel Caps with Vent—Cap with vent will automatically open when the internal pressure reaches between 6.5 psi to 8.5 psi to relieve pressure.

	Pipe Size	Gender	Opening Temp., ° F	Specs. Met	Message		Each
Aluminum







	Fuel Caps

	8"	6 1/2"	Buna-N	2	Female	190	D.O.T. Compliant 49 CFR 393.67	Diesel Fuel Only	000000	000000




			Fuel Caps with Vent

			6"	4 1/2"	Buna-N	2	Female	255	D.O.T. Compliant 49 CFR 393.67	Diesel Fuel Only	000000	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"	0000000	000000


	2 1/8"	Not Rated	5 1/8"	Air, Oil	Steel	304 Stainless Steel	6	Yes	40	3/8"	0000000	00000
	2 1/8"	Not Rated	6 1/8"	Air, Oil	Steel	Nylon	6	Yes	10	3/8"	0000000	00000
	2 1/8"	Not Rated	6 1/8"	Air, Oil	Steel	Nylon	6	Yes	40	3/8"	0000000	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"	0000000	000000

Locking Drum Plug Caps


Male	Female

Prevent tampering with the contents of your drum while allowing access for filling.

	Gender	Dia.	Ht.	Lock Type	Lock Included	For Max. Shackle Dia.		Each
Iron



	2 NPT	Male	3 1/8"	2 1/4"	Padlockable	No	7/16"	0000000	000000


	2 NPT	Female	3 1/8"	1 3/8"	Padlockable	No	5/16"	0000000	00000
	3 NPT	Female	4 1/2"	2"	Padlockable	No	1/2"	0000000	00000
	4 NPT	Female	5 1/4"	2 1/4"	Padlockable	No	1/2"	0000000	000000

Gas Tank Safety Caps

Protect the valve of high-pressure gas tanks. The cap fits tanks with and without a regulator.

For Cylinder Size	Thread Size	Material	Specs. Met		Each
K, T	3 1/8"-11	Steel	D.O.T. Compliant 49 CFR 173.301, OSHA Compliant 29 CFR 1910.253	0000000	000000

Gas Tank Safety Collars

Use a collar to protect the valve of acetylene tanks. The collar fits tanks with and without a regulator.

For Cylinder Size	Thread Size	Material	Specs. Met		Each
5	3 1/2"-11	Steel	D.O.T. Compliant 49 CFR 173.301, OSHA Compliant 29 CFR 1910.253	0000000	000000

Gas Cylinder Lockouts

Prohibit access to the main valve on a gas cylinder. These lockouts secure with a padlock and lockout tag. They help you comply with OSHA 29 CFR 1910.147, which requires handles on pneumatic and hydraulic systems to be locked out during maintenance to prevent injuries.

Powder-Coated Steel


C (Padlock Not Included)	C (Shown Open)

Steel lockouts are stronger than plastic lockouts. They’re also powder coated for corrosion resistance.

Style C—Style C fit most high- and low-pressure gas cylinders, including D.O.T. cylinders. When you need to use your cylinder, you can leave these lockouts on—the cover swings up and out of the way when they’re unlocked. To lock out again, snap the cover back on.

		Thread
	Style	Type	Spacing	Direction	Gender	For Max. No. of Padlocks	For Max. Padlock Shackle Dia.	Overall Lg.	Max. Temp., ° F	Color	Includes	Specs. Met		Each
For Low Pressure Gas Cylinders



		C	UNC	Coarse	Right Hand	Female	1	1/4"	11"	200	Yellow	Padlock Three Keys	OSHA Compliant 29 CFR 1910.147	00000000	0000000


		C	UNF	Fine	Right Hand	Female	1	1/4"	11"	200	Yellow	Padlock Three Keys	OSHA Compliant 29 CFR 1910.147	00000000	000000


		For High Pressure Gas Cylinders



				C	UNC	Coarse	Right Hand	Female	1	1/4"	11"	200	Yellow	Padlock Three Keys	OSHA Compliant 29 CFR 1910.147	00000000	000000


				C	UNF	Fine	Right Hand	Female	1	1/4"	11"	200	Yellow	Padlock Three Keys	OSHA Compliant 29 CFR 1910.147	00000000	000000