Stop Check Valves | McMaster-Carr

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96 Products

Freeze-Resistant Vacuum Breakers with Garden-Hose Threads

Stop backward flow in outdoor faucets with garden hose outlets. This valve drains when closed to prevent freezing. To prevent tampering, tighten the set screw until the head breaks off.

	Inlet			Outlet							Brass
Ht.	Hose Size	Thread Type	Gender	Hose Size	Thread Type	Gender	Max. Pressure @ Temp.	For Use Outdoors	Specs. Met	Certification	Temp. Range, ° F		Each



	2"	3/4	GHT	Female	3/4	GHT	Male	125 psi @ 70° F	Yes	ASME A112.1.3, ASSE 1011, CAN/CSA-B64.2	CSA Certified	35 to 180	46605K88	000000

Inline Hydraulic Check Valves

Hydraulic check valves open to allow flow in one direction and close when flow stops or reverses.

NPTF Female Inlet × NPTF Female Outlet—Ball Check Valve

Image of Product. Front orientation. Hydraulic Check Valves. Inline Hydraulic Check Valves, NPTF Female Inlet × NPTF Female Outlet—Ball Check Valve.

NPTF (Dryseal) threads are compatible with NPT threads.

Brass Body—Brass valves have good corrosion resistance.

303 Stainless Steel Body—303 stainless steel valves are more corrosion resistant than brass valves.

	Inlet Connection		Outlet Connection
	Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Port-to-Port Lg.	Hex Wd.	Mounting Position	Temp. Range, ° F		Each
Brass Body



		1/8	02	1/8	02	1.5	0.23	2,000	2.5	1 1/2"	11/16"	Any Angle	-15 to 400	5010K71	000000


		1/4	04	1/4	04	3	0.54	2,000	2.5	2"	7/8"	Any Angle	-15 to 400	5010K72	00000
		1/4	04	1/4	04	6	1.47	2,000	2.5	2"	3/4"	Any Angle	-30 to 200	4620K21	00000
		3/8	06	3/8	06	5	0.83	2,000	2.5	2 1/4"	1 1/16"	Any Angle	-15 to 400	5010K73	00000
		3/8	06	3/8	06	10	3.3	2,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	4620K22	00000
		1/2	08	1/2	08	8	1.47	2,000	2.5	2 3/4"	1 5/16"	Any Angle	-15 to 400	5010K74	00000
		1/2	08	1/2	08	12	3.6	2,000	2.5	2 7/8"	1 1/8"	Any Angle	-30 to 200	4620K23	00000
		3/4	12	3/4	12	12	1.9	2,000	2.5	3"	1 5/8"	Any Angle	-15 to 400	5010K46	00000
		3/4	12	3/4	12	20	5.41	2,000	2.5	3 1/4"	1 3/8"	Any Angle	-30 to 200	4620K24	00000


		Steel Body



				1/8	02	1/8	02	1.5	0.23	5,000	2.5	1 1/2"	11/16"	Any Angle	-15 to 400	5010K51	00000


				1/4	04	1/4	04	3	0.54	5,000	2.5	2"	7/8"	Any Angle	-15 to 400	5010K52	00000
				1/4	04	1/4	04	6	1.47	5,000	2.5	2"	3/4"	Any Angle	-30 to 200	4620K41	00000
				3/8	06	3/8	06	5	0.83	5,000	2.5	2 1/4"	1 1/16"	Any Angle	-15 to 400	5010K53	00000
				3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	4620K42	00000
				1/2	08	1/2	08	8	1.47	5,000	2.5	2 3/4"	1 5/16"	Any Angle	-15 to 400	5010K54	00000
				1/2	08	1/2	08	12	3.6	5,000	2.5	2 7/8"	1 1/8"	Any Angle	-30 to 200	4620K43	00000
				3/4	12	3/4	12	12	1.9	5,000	2.5	3"	1 5/8"	Any Angle	-15 to 400	5010K26	00000
				3/4	12	3/4	12	20	5.41	5,000	2.5	3 1/4"	1 3/8"	Any Angle	-30 to 200	4620K44	00000


				303 Stainless Steel Body



						1/8	02	1/8	02	1.5	0.23	5,000	2.5	1 1/2"	11/16"	Any Angle	-15 to 400	5010K61	00000


						1/4	04	1/4	04	3	0.54	5,000	2.5	2"	7/8"	Any Angle	-15 to 400	5010K62	00000
						1/4	04	1/4	04	6	1.47	5,000	2.5	2"	3/4"	Any Angle	-30 to 200	4620K81	000000
						3/8	06	3/8	06	5	0.83	5,000	2.5	2 1/4"	1 1/16"	Any Angle	-15 to 400	5010K63	000000
						3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	4620K82	000000
						1/2	08	1/2	08	8	1.47	5,000	2.5	2 3/4"	1 5/16"	Any Angle	-15 to 400	5010K64	000000
						1/2	08	1/2	08	12	3.6	5,000	2.5	2 7/8"	1 1/8"	Any Angle	-30 to 200	4620K83	000000
						3/4	12	3/4	12	20	5.41	5,000	2.5	3 1/4"	1 3/8"	Any Angle	-30 to 200	4620K84	000000

NPTF Male Inlet × NPTF Male Outlet—Ball Check Valve

NPTF (Dryseal) threads are compatible with NPT threads.

Brass Body—Brass valves have good corrosion resistance.

303 Stainless Steel Body—303 stainless steel valves are more corrosion resistant than brass valves.

	Inlet Connection		Outlet Connection
	Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Seal Material	Port-to-Port Lg.	Hex Wd.	Mounting Position	Temp. Range, ° F		Each
Brass Body



		1/8	02	1/8	02	1	0.17	2,000	2.5	—	1"	7/16"	Any Angle	-30 to 190	46105K61	000000


		1/8	02	1/8	02	1	0.17	2,000	2.5	Buna-N	1"	7/16"	Any Angle	-30 to 190	46105K59	00000
		1/4	04	1/4	04	2.5	0.56	2,000	2.5	—	1 3/8"	5/8"	Any Angle	-30 to 190	46105K62	00000
		1/4	04	1/4	04	2.5	0.56	2,000	2.5	Buna-N	1 3/8"	5/8"	Any Angle	-30 to 190	46105K69	00000
		3/8	06	3/8	06	6	1.31	2,000	2.5	—	1 5/8"	3/4"	Any Angle	-30 to 190	46105K63	00000
		3/8	06	3/8	06	6	1.31	2,000	2.5	Buna-N	1 5/8"	3/4"	Any Angle	-30 to 190	46105K71	00000
		1/2	08	1/2	08	10	2.71	2,000	2.5	—	2 1/8"	7/8"	Any Angle	-30 to 190	46105K64	00000
		1/2	08	1/2	08	10	2.71	2,000	2.5	Buna-N	2 1/8"	7/8"	Any Angle	-30 to 190	46105K72	00000
		3/4	12	3/4	12	15	3.4	2,000	2.5	Buna-N	2 1/4"	1 1/8"	Any Angle	-30 to 190	46105K73	00000


		Steel Body



				1/4	04	1/4	04	2.5	0.56	3,000	2.5	—	1 3/8"	5/8"	Any Angle	-30 to 190	46105K65	00000


				1/4	04	1/4	04	2.5	0.56	3,000	2.5	Buna-N	1 3/8"	5/8"	Any Angle	-30 to 190	46105K74	00000
				3/8	06	3/8	06	6	1.31	3,000	2.5	—	1 5/8"	3/4"	Any Angle	-30 to 190	46105K66	00000
				3/8	06	3/8	06	6	1.31	3,000	2.5	Buna-N	1 5/8"	3/4"	Any Angle	-30 to 190	46105K75	00000
				1/2	08	1/2	08	10	2.71	3,000	2.5	—	2 1/8"	7/8"	Any Angle	-30 to 190	46105K67	00000
				1/2	08	1/2	08	10	2.71	3,000	2.5	Buna-N	2 1/8"	7/8"	Any Angle	-30 to 190	46105K76	00000


				303 Stainless Steel Body



						1/4	04	1/4	04	2.5	0.56	3,000	2.5	—	1 3/8"	5/8"	Any Angle	-30 to 190	46105K68	00000


						1/4	04	1/4	04	2.5	0.56	3,000	2.5	Buna-N	1 3/8"	5/8"	Any Angle	-30 to 190	46105K77	00000
						3/8	06	3/8	06	6	1.31	3,000	2.5	Buna-N	1 5/8"	3/4"	Any Angle	-30 to 190	46105K78	00000

BSPT Female Inlet × BSPT Female Outlet—Ball Check Valve

	Inlet Connection		Outlet Connection
	Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Port-to-Port Lg.	Hex Wd.	Mounting Position	Temp. Range, ° F		Each
Steel Body



		1/4	04	1/4	04	6	1.47	5,000	2.5	2"	3/4"	Any Angle	-30 to 200	1744N1	000000


		3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	1744N2	00000
		1/2	08	1/2	08	12	3.6	5,000	2.5	2 7/8"	1 1/8"	Any Angle	-30 to 200	1744N3	00000
		3/4	12	3/4	12	20	5.41	5,000	2.5	3 1/4"	1 3/8"	Any Angle	-30 to 200	1744N4	00000

BSPP Female Inlet × BSPP Female Outlet—Ball Check Valve

	Inlet Connection		Outlet Connection
	Pipe Size	Dash Size	Pipe Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Port-to-Port Lg.	Hex Wd.	Mounting Position	Temp. Range, ° F		Each
Steel Body



		1/4	04	1/4	04	6	1.47	5,000	2.5	2"	3/4"	Any Angle	-30 to 200	1744N5	000000


		3/8	06	3/8	06	10	3.3	5,000	2.5	2 1/2"	1"	Any Angle	-30 to 200	1744N6	00000
		1/2	08	1/2	08	12	3.6	5,000	2.5	2 7/8"	1 1/8"	Any Angle	-30 to 200	1744N7	00000
		3/4	12	3/4	12	20	5.41	5,000	2.5	3 1/4"	1 3/8"	Any Angle	-30 to 200	1744N8	00000

UN/UNF (SAE Straight) Male Inlet × UN/UNF (JIC) Male Outlet—Poppet Check Valve

UN/UNF (SAE Straight) thread connections have straight threads and are also known as O-ring Boss fittings.

Valves with a poppet have internal components that can handle any flow rates. The higher the flow rate of the hydraulic fluid coming into the valve, the lower the pressure the fluid is as it leaves the valve.

	Inlet Connection		Outlet Connection
	Thread Size	Dash Size	Thread Size	Dash Size	Fitting Connection	Max. Flow Rate	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Seal Material	Port-to-Port Lg.	Hex Wd.	Mounting Position	Temp. Range, ° F		Each
Steel Body



		7/16"-20	04	7/16"-20	04	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	1 1/4"	9/16"	Any Angle	-40 to 250	2300N39	000000


		9/16"-18	06	9/16"-18	06	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	1 1/4"	3/4"	Any Angle	-40 to 250	2300N41	00000
		3/4"-16	08	3/4"-16	08	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	1 5/8"	7/8"	Any Angle	-40 to 250	2300N42	00000
		7/8"-14	10	7/8"-14	10	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	1 7/8"	1"	Any Angle	-40 to 250	2300N43	000000
		1 1/16"-12	12	1 1/16"-12	12	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	2 1/8"	1 1/4"	Any Angle	-40 to 250	2300N44	000000
		1 5/16"-12	16	1 5/16"-12	16	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	2 1/2"	1 1/2"	Any Angle	-40 to 250	2300N45	000000

UN/UNF (JIC) Male Inlet × UN/UNF (SAE Straight) Male Outlet—Poppet Check Valve

UN/UNF (SAE Straight) thread connections have straight threads and are also known as O-ring Boss fittings.

	Inlet Connection			Outlet Connection
	Thread Size	Dash Size	Fitting Connection	Thread Size	Dash Size	Max. Flow Rate	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Seal Material	Port-to-Port Lg.	Hex Wd.	Mounting Position	Temp. Range, ° F		Each
Steel Body



		7/16"-20	04	37° Flared	7/16"-20	04	Not Rated	Not Rated	5,000	5	Buna-N	1 1/4"	9/16"	Any Angle	-40 to 250	2300N18	000000


		9/16"-18	06	37° Flared	9/16"-18	06	Not Rated	Not Rated	5,000	5	Buna-N	1 1/4"	3/4"	Any Angle	-40 to 250	2300N19	00000
		3/4"-16	08	37° Flared	3/4"-16	08	Not Rated	Not Rated	5,000	5	Buna-N	1 5/8"	7/8"	Any Angle	-40 to 250	2300N21	00000
		7/8"-14	10	37° Flared	7/8"-14	10	Not Rated	Not Rated	5,000	5	Buna-N	1 7/8"	1"	Any Angle	-40 to 250	2300N22	000000
		1 1/16"-12	12	37° Flared	1 1/16"-12	12	Not Rated	Not Rated	5,000	5	Buna-N	2 1/8"	1 1/4"	Any Angle	-40 to 250	2300N23	000000
		1 5/16"-12	16	37° Flared	1 5/16"-12	16	Not Rated	Not Rated	5,000	5	Buna-N	2 1/2"	1 1/2"	Any Angle	-40 to 250	2300N24	000000

UN/UNF (JIC) Male Inlet × UN/UNF (JIC) Male Outlet—Poppet Check Valve

	Inlet Connection			Outlet Connection
	Thread Size	Dash Size	Fitting Connection	Thread Size	Dash Size	Fitting Connection	Max. Flow Rate	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Seal Material	Port-to-Port Lg.	Hex Wd.	Mounting Position	Temp. Range, ° F		Each
Steel Body



		7/16"-20	04	37° Flared	7/16"-20	04	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	1 1/2"	9/16"	Any Angle	-40 to 250	2300N11	000000


		9/16"-18	06	37° Flared	9/16"-18	06	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	1 1/2"	3/4"	Any Angle	-40 to 250	2300N12	00000
		3/4"-16	08	37° Flared	3/4"-16	08	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	1 7/8"	7/8"	Any Angle	-40 to 250	2300N13	00000
		7/8"-14	10	37° Flared	7/8"-14	10	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	2"	1"	Any Angle	-40 to 250	2300N14	000000
		1 1/16"-12	12	37° Flared	1 1/16"-12	12	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	2 1/2"	1 1/4"	Any Angle	-40 to 250	2300N15	000000
		1 5/16"-12	16	37° Flared	1 5/16"-12	16	37° Flared	Not Rated	Not Rated	5,000	5	Buna-N	2 5/8"	1 1/2"	Any Angle	-40 to 250	2300N16	000000

Sump Pump Backflow-Prevention Valves with Clamps

Prevent dirty water from flowing back to your pump. Valves have flexible couplers with hose clamps to slip over PVC tubing for easy installation. At least 2 psi is required to open valves. Install for horizontal or upward flow.

Pipe Size	Max. Pressure @ Temp.	Max. Flow Rate @ 10 ft. of Head, gpm	Temp. Range, ° F	Body Material	Color	Seal Material	End-to-End Lg.		Each
1 1/4, 1 1/2	25 psi @ 70° F	4.3	35 to 130	ABS	Black	EPDM/Stainless Steel	4 13/16"	7744K11	000000
2	25 psi @ 70° F	4.3	35 to 130	ABS	Green	EPDM/Stainless Steel	6"	7744K12	00000

Arresters for Flammable Vapors

Minimize fire hazard from flammable vapors. Mount an arrester to your vent pipe to stop flames from traveling back into your tank. If the ambient temperature reaches 165° F, the fusible links melt, and the cover closes to block flames from the arrester.

Replacement Fusible Links—To reuse the arrester, replace the fusible links (sold separately).

Flame Arresters							Replacement Fusible Links
Pipe Size	Thread Type	Gender	Material	Certification		Each		Each
2	NPT	Female	Aluminum, Cast Iron	UL Listed	1206K81	000000000	1206K85	000000

Air Compressor Air Flow Check Valves

Prevent air from escaping an air storage tank when the air compressor is not running. These valves install on the inlet of a tank. They open to allow airflow into the tank and close when flow stops or reverses direction. They have a _1/8 NPT tapped unloader port with removable plug for connecting to a pressure switch.

NPT Female Inlet × NPT Male Outlet

Image of Product. Front orientation. Contains Annotated. Air Flow Check Valves. Air Compressor Air Flow Check Valves, NPT Female Inlet × NPT Male Outlet.

Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.

	Outlet Pipe Size	Flow Coefficient (Cv)	Min. Flow Rate	Max. Flow Rate, scfm	Max. Pressure, psi	Min. Opening Pressure, psi	Temp. Range, ° F	Overall Lg.	Hex Size		Each
Brass Body



	3/8	1/2	Not Rated	Not Rated	20	450	3	-15 to 400	2 11/16"	7/8"	2745N11	000000


	1/2	1/2	Not Rated	Not Rated	20	450	3	-15 to 400	2 15/16"	1"	2745N12	00000
	3/4	3/4	Not Rated	Not Rated	30	450	3	-15 to 400	2 3/4"	1 3/16"	2745N13	00000
	3/4	1	Not Rated	Not Rated	60	450	3	-15 to 400	3 11/16"	1 5/16"	2745N14	00000
	1	1	Not Rated	Not Rated	60	450	3	-15 to 400	4 1/8"	1 1/2"	2745N15	00000
	1 1/4	1 1/4	Not Rated	Not Rated	130	450	3	-15 to 400	4 7/16"	1 7/8"	2745N16	00000

Compression Inlet × NPT Male Outlet

Image of Product. Front orientation. Contains Annotated. Air Flow Check Valves. Air Compressor Air Flow Check Valves, Compression Inlet × NPT Male Outlet.

Flow Coefficient (Cv)—Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.

	Outlet Pipe Size	Flow Coefficient (Cv)	Min. Flow Rate	Max. Flow Rate, scfm	Max. Pressure, psi	Min. Opening Pressure, psi	Temp. Range, ° F	Overall Lg.	Hex Size		Each
Brass Body



	1/2"	1/2	Not Rated	Not Rated	20	450	3	-15 to 400	2 7/8"	7/8"	2745N17	000000


	3/4"	3/4	Not Rated	Not Rated	30	450	3	-15 to 400	3 9/16"	1 1/8"	2745N18	00000

Screw-In Hydraulic Check Valves

These hydraulic check valves open to allow flow in one direction and close when flow stops or reverses. Also known as cartridge valves, they screw into your mounting block.

Ball Check Valve

Image of Product. Front orientation. Hydraulic Check Valves. Screw-In Hydraulic Check Valves.

				Body—UN/UNF (SAE Straight)
	Deltrol Equivalent Model No.	Hydraforce Equivalent Model No.	Parker Equivalent Model No.	Thread Size	Dash Size	Max. Flow Rate, gpm	Flow Coefficient (Cv)	Max. Pressure, psi	Min. Opening Pressure, psi	Seal Material	Overall Ht.	Mounting Position		Each
Black Anodized Aluminum Body



		DCV-080-B-N-2	—	—	3/4"-16	08	5	Not Rated	3,000	2	Buna-N	1 1/4"	Any Angle	1731N11	000000


		DCV-080-B-N-5	—	—	3/4"-16	08	5	Not Rated	3,000	5	Buna-N	1 1/4"	Any Angle	1731N12	00000
		DCV-080-B-N-10	CV08-20-0-N-10	—	3/4"-16	08	5	Not Rated	3,000	10	Buna-N	1 1/4"	Any Angle	1731N13	00000
		DCV-080-B-N-25	CV08-20-0-N-25	—	3/4"-16	08	5	Not Rated	3,000	25	Buna-N	1 1/4"	Any Angle	1731N14	00000
		DCV-100-B-N-5	CV10-20-0-N-05	—	7/8"-14	10	20	Not Rated	3,000	5	Buna-N	1 5/8"	Any Angle	1731N15	00000
		DCV-100-B-N-15	CV10-20-0-N-15	D04B2-1.0-N	7/8"-14	10	20	Not Rated	3,000	15	Buna-N	1 5/8"	Any Angle	1731N17	00000
		DCV-100-B-N-30	CV10-20-0-N-30	—	7/8"-14	10	20	Not Rated	3,000	30	Buna-N	1 5/8"	Any Angle	1731N18	00000
		DCV-100-B-N-60	—	D04B2-2.1-N	7/8"-14	10	20	Not Rated	3,000	60	Buna-N	1 5/8"	Any Angle	1731N19	00000

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 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