Hose Check Valves | McMaster-Carr

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50 psi

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33 Products

Welding Gas Check Valves for Regulators

Stop the reverse flow of gas in your regulator. Check valves do not stop flashbacks.

Max. Pressure, psi				Male Hose Connection			Male Pipe Connection
Oxygen	Acetylene	Hydrogen	Propane	Thread Direction	Thread Size	Thread Type	Thread Direction	Pipe Size	Thread Type	Material		Each
125	—	—	—	Right Hand	9/16"-18	UNF	Right Hand	1/4	NPT	Brass	7957A3	000000
—	50	50	50	Right Hand	9/16"-18	UNF	Left Hand	1/4	NPT	Brass	7957A4	00000

Welding Gas Flashback Arresters for Regulators

Attach these arresters to the outlet connection of a regulator on a torch that cuts steel up to 11" thick. Arresters extinguish flames and have a check valve to stop reverse gas flow. They are reusable; resetting is not required after flashback.

Right-Hand Threads—UNF Male × UNF Female

Standard

Flashback

Arresters

High Flow

Flashback

Arresters

Quick Disconnect

Flashback Arresters

Arresters with right-hand threads are for use with oxygen.

High Flow Flashback Arresters—High-flow arresters give you twice the airflow rate compared to standard flashback arresters when they’re used at the same inlet pressure. They are often used with larger torch tips.

Quick Disconnect Flashback Arresters—Quick-disconnect arresters have a fitting that connects and disconnects them from your torch, so you don't have to thread these arresters on and off with a wrench.

	Max. Pressure for Oxygen, psi	Material	Specs. Met		Each
Standard Flashback Arresters



	3/8"-24	143	Brass	EN 730, ISO 5175	7942A51	000000


	9/16"-18	143	Brass	EN 730, ISO 5175	78335A67	00000


	High Flow Flashback Arresters



			9/16"-18	143	Brass	EN 730, ISO 5175	78335A36	000000


			7/8"-14	143	Brass	EN 730, ISO 5175	78335A52	000000


			Quick Disconnect Flashback Arresters



					9/16"-18	143	Brass	EN 561, ISO 7289	78335A56	000000

Left-Hand Threads—UNF Male × UNF Female


Standard Flashback Arresters	High Flow Flashback Arresters	Quick Disconnect Flashback Arresters

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

		Max. Pressure, psi
	Thread Size	Acetylene	Hydrogen	Propane	Material	Specs. Met		Each
Standard Flashback Arresters



		3/8"-24	15	50	50	Brass	EN 730, ISO 5175	7942A52	000000


		9/16"-18	15	50	50	Brass	EN 730, ISO 5175	78335A25	00000


		High Flow Flashback Arresters



				9/16"-18	15	50	50	Brass	EN 730, ISO 5175	78335A28	000000


				7/8"-14	15	50	50	Brass	EN 730, ISO 5175	78335A51	000000


				Quick Disconnect Flashback Arresters



						9/16"-18	15	50	50	Brass	EN 561, ISO 7289	78335A55	000000

Right-Hand and Left-Hand Threads—UNF Male × UNF Female

Standard

Flashback

Arresters

Arresters with right-hand threads are for use with oxygen.

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

		Max. Pressure, psi
	Thread Size	Oxygen	Acetylene	Hydrogen	Propane	Material	Specs. Met		Pair
Standard Flashback Arresters



		9/16"-18	143	15	50	50	Brass	EN 730, ISO 5175	78335A43	0000000

Welding Gas Check Valves for Torches

Stop the reverse flow of gas in your torch. Check valves do not stop flashbacks.

Max. Pressure, psi				Male Hose Connection			Female Hose Connection
Oxygen	Acetylene	Hydrogen	Propane	Thread Direction	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Material		Each
125	—	—	—	Right Hand	9/16"-18	UNF	Right Hand	9/16"-18	UNF	Brass	7957A1	000000
—	50	50	50	Left Hand	3/8"-24	UNF	Left Hand	3/8"-24	UNF	Brass	7957A8	00000
—	50	50	50	Left Hand	9/16"-18	UNF	Left Hand	9/16"-18	UNF	Brass	7957A2	00000

Vacuum Breakers with Garden-Hose Fittings

Set Screw

Tamper-Resistant

Set Screw

Prevent dirty, contaminated water from backing up into your garden hose line—install these vacuum breakers between a faucet and a garden hose. Also known as vacuum-breaking valves, these valves have a built-in check valve that blocks backflow, so you can leave your hose in a utility sink full of dirty water without the water going back into the line.

When the check valve is closed, it has vents that open to release the water. This reduces pressure in the line and confirms the valve is working. Because these valves vent water, use them in environments where spilled water won’t cause a problem. This design adheres to ASSE Standard 1011 for valves with a vent.

Mount valves to faucet outlets with a set screw, and easily thread or unthread a hose while the valves stay in place.

Valves comply with Uniform Plumbing Code (UPC) and are CSA certified, so they're safe to use in sanitary plumbing systems because they prevent contamination from flowing backward into your line.

These valves are designed to be used intermittently. They've been tested under ASME A112.1.3, which assumes the valves will not be used for more than 12 hours at a time.

Tamper-Resistant Set Screw—Valves with tamper-resistant set screws have a head that breaks off after tightening to prevent valve removal after installation.

NSF/ANSI 372—Valves that meet NSF/ANSI Standard 372 are certified lead free.

Chrome-Plated Brass Body—Chrome-plated brass valves are more corrosion resistant than plain brass valves.

											Brass Body			Chrome-Plated Brass Body
	Inlet Hose Size	Outlet Hose Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	End-to-End Lg.	Food Industry Std.	Specs. Met	Certification	Seal Material	For Use With	Temp. Range, ° F		Each	Temp. Range, ° F		Each
GHT Female Inlet × GHT Male Outlet







				Set Screw

				3/4	3/4	Not Rated	125 psi @ 70° F	1 1/2"	—	ASME A112.1.3, ASSE 1001, ASSE 1011, CAN/CSA-B64.2, UPC Compliant	CSA Certified IAPMO Listed	Rubber	Water	30 to 180	46605K55	000000	30 to 180	46605K58	000000


				3/4	3/4	Not Rated	125 psi @ 70° F	1 1/2"	NSF/ANSI 372	ASME A112.1.3, ASSE 1001, ASSE 1011, CAN/CSA-B64.2, UPC Compliant	CSA Certified IAPMO Listed	Rubber	Water	—	———	0	30 to 180	46605K13	00000




						Tamper-Resistant Set Screw

						3/4	3/4	Not Rated	125 psi @ 70° F	1 1/2"	—	ASME A112.1.3, ASSE 1001, ASSE 1011, CAN/CSA-B64.2, UPC Compliant	CSA Certified IAPMO Listed	Rubber	Water	30 to 180	46605K75	00000	30 to 180	46605K85	00000


						3/4	3/4	Not Rated	125 psi @ 70° F	1 1/2"	NSF/ANSI 372	ASME A112.1.3, ASSE 1001, ASSE 1011, CAN/CSA-B64.2, UPC Compliant	CSA Certified IAPMO Listed	Rubber	Water	33 to 180	46605K121	00000	—	———	0

Welding Gas Flashback Arresters for Torches

These arresters attach directly to torches that cut steel up to 8" thick. They extinguish flames and have a check valve to stop reverse gas flow. They are reusable; resetting is not required after flashback.

Right-Hand Threads—UNF Male × UNF Female

Standard

Flashback

Arresters

High Flow

Flashback

Arresters

Quick Disconnect

Flashback Arresters

Arresters with right-hand threads are for use with oxygen.

	Max. Pressure for Oxygen, psi	Material	Specs. Met		Each
Standard Flashback Arresters



	9/16"-18	143	Brass	EN 730, ISO 5175	78335A31	000000


	High Flow Flashback Arresters



			3/8"-24	143	Brass	EN 730, ISO 5175	7942A11	00000


			9/16"-18	143	Brass	EN 730, ISO 5175	78335A47	000000
			7/8"-14	143	Brass	EN 730, ISO 5175	78335A49	000000


			Quick Disconnect Flashback Arresters



					9/16"-18	143	Brass	EN 561, ISO 7289	78335A65	00000

Left-Hand Threads—UNF Male × UNF Female


Standard Flashback Arresters	High Flow Flashback Arresters	Quick Disconnect Flashback Arresters

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

		Max. Pressure, psi
	Thread Size	Acetylene	Hydrogen	Propane	Material	Specs. Met		Each
Standard Flashback Arresters



		9/16"-18	15	50	50	Brass	EN 730, ISO 5175	78335A22	000000


		High Flow Flashback Arresters



				3/8"-24	15	50	50	Brass	EN 730, ISO 5175	7942A12	00000


				9/16"-18	15	50	50	Brass	EN 730, ISO 5175	78335A46	000000
				7/8"-14	15	50	50	Brass	EN 730, ISO 5175	78335A48	000000


				Quick Disconnect Flashback Arresters



						9/16"-18	15	50	72	Brass	EN 561, ISO 7289	78335A24	00000

Right-Hand and Left-Hand Threads—UNF Male × UNF Female

Standard

Flashback

Arresters

Arresters with right-hand threads are for use with oxygen.

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

		Max. Pressure, psi
	Thread Size	Oxygen	Acetylene	Hydrogen	Propane	Material	Specs. Met		Pair
Standard Flashback Arresters



		9/16"-18	143	15	50	50	Brass	EN 730, ISO 5175	78335A41	0000000