Y-Style Valves | McMaster-Carr

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70 Products

About Backflow-Prevention Valves

About On/Off Valves

About Fire-Fighting Hose Threads

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

High-Flow Threaded Check Valves

To achieve the maximum possible flow, internal components are designed to reduce flow resistance. These valves open to allow flow in one direction and close when flow stops or reverses. A removable cap provides easy access to internal components for maintenance.

Repair kits include everything you need to rebuild the valve.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

Bronze Body

Repair Kit for 200 and 300 Pressure Classes

For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
Disc Material: See table
Seal Material: See table

Valves												Repair Kits
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Disc Material	Seal Material	End-to-End Lg.	Features		Each		Each
NPT Female × NPT Female—Pressure Class 150
1/4	2.3	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	000000	00
3/8	4.3	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	00000	000000	00
1/2	7.2	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	2 5/8"	Removable Cap	0000000	00000	000000	00
3/4	13	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	3"	Removable Cap	0000000	000000	000000	00
1	22	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	3 11/16"	Removable Cap	0000000	000000	000000	00
1 1/4	39	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	4 3/8"	Removable Cap	0000000	000000	000000	00
1 1/2	56	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Brass	Brass	4 5/8"	Removable Cap	0000000	000000	000000	00
2	92	300 psi @ 150° F	150 psi @ 366° F	0.5	-20° to 405°	Bronze	Bronze	5 7/8"	Removable Cap	0000000	000000	000000	00
NPT Female × NPT Female—Pressure Class 200
1/4	2.3	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	000000
3/8	4.3	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000
1/2	7.2	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	2 5/8"	Removable Cap	0000000	000000	00000000	00000
3/4	13	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	3"	Removable Cap	0000000	000000	00000000	00000
1	22	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	3 11/16"	Removable Cap	0000000	000000	00000000	00000
1 1/4	39	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	4 3/8"	Removable Cap	0000000	000000	00000000	000000
1 1/2	56	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	4 5/8"	Removable Cap	0000000	000000	00000000	000000
2	92	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	5 7/8"	Removable Cap	0000000	000000	00000000	000000
2 1/2	150	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	7"	Removable Cap	0000000	000000	00000000	000000
NPT Female × NPT Female—Pressure Class 300
1/4	2.3	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000
3/8	4.3	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	2 1/4"	Removable Cap	0000000	000000	00000000	00000
1/2	7.2	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	2 5/8"	Removable Cap	0000000	000000	00000000	00000
3/4	13	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	3"	Removable Cap	0000000	000000	00000000	00000
1	22	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	3 11/16"	Removable Cap	0000000	000000	00000000	00000
1 1/4	39	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	4 3/8"	Removable Cap	0000000	000000	00000000	000000
1 1/2	56	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	4 5/8"	Removable Cap	0000000	000000	00000000	000000
2	92	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	5 7/8"	Removable Cap	0000000	000000	00000000	000000
2 1/2	150	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	7"	Removable Cap	0000000	00000000	00000000	000000

Clear-View Socket-Connect Check Valves

For Use With: Air, Water
Piston Material: PVC Plastic
Seal Material: EPDM Rubber

Visually inspect flow and debris accumulation through the transparent valve body. Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection. These valves open to allow flow in one direction and close when flow stops or reverses. They have a removable cap that provides easy access to internal components for maintenance.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

PVC Plastic Body
Pipe Size	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.	Features		Each
Socket Connect × Socket Connect
1/2	40, 80	6.7	150 psi @ 70° F	0.29	35° to 140°	Clear	5 5/8"	Removable Cap	0000000	000000
3/4	40, 80	11.9	150 psi @ 70° F	0.29	35° to 140°	Clear	6 5/16"	Removable Cap	0000000	00000
1	40, 80	21	150 psi @ 70° F	0.29	35° to 140°	Clear	6 7/8"	Removable Cap	0000000	00000
1 1/2	40, 80	49	150 psi @ 70° F	0.29	35° to 140°	Clear	8 1/8"	Removable Cap	0000000	000000
2	40, 80	77	150 psi @ 70° F	0.29	35° to 140°	Clear	8 7/8"	Removable Cap	0000000	000000
3	40, 80	168	150 psi @ 70° F	0.29	35° to 140°	Clear	12 1/4"	Removable Cap	0000000	000000

Check Valves with Solder-Connect Fittings

For Use With: Steam, Water
Disc Material: Bronze
Seal Material: Bronze

Solder these valves to copper tubing for a permanent, leak-tight connection. They open to allow flow in one direction and close when flow stops or reverses. All have a removable cap that provides easy access to internal components for maintenance.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

Bronze Body
For Copper Tube Size	For Tube OD	Flow Coefficient (Cv)	Pressure Class	Max. Pressure	Max. Steam Pressure	Min. Opening Pressure, psi	Temperature Range, °F	End-to-End Lg.	Features		Each
Solder Connect × Solder Connect
1/4	3/8"	1.3	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	2 1/16"	Removable Cap	0000000	000000
3/8	1/2"	2.5	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	2 1/16"	Removable Cap	0000000	00000
1/2	5/8"	4.8	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	2 9/16"	Removable Cap	0000000	00000
3/4	7/8"	14.3	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	3 3/8"	Removable Cap	0000000	000000
1	1 1/8"	24	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	4 1/16"	Removable Cap	0000000	000000
1 1/2	1 5/8"	60	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	5 1/4"	Removable Cap	0000000	000000
2	2 1/8"	102	125	200 psi @ 70° F	125 psi @ 350° F	0.5	-20° to 405°	6 3/8"	Removable Cap	0000000	000000

Socket-Connect Check Valves for Harsh Chemicals

Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection. These valves have a plastic body and a fluoroelastomer seal for excellent chemical resistance. They open to allow flow in one direction and close when flow stops or reverses.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

PVC Plastic Body

For Use With: Citric Acid, Deionized Water, Diesel Fuel, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Mineral Spirits, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Sodium Hypochlorite, Water
Piston Material: PVC Plastic
Spring Material: PVC Plastic
Seal Material: Fluoroelastomer Rubber

Socket Connect × Socket Connect
Pipe Size	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.		Each
1/2	40, 80	0.8	150 psi @ 70° F	2	40° to 140°	Dark Gray	3 3/8"	000000	0000000
3/4	40, 80	3	150 psi @ 70° F	2	40° to 140°	Dark Gray	4 3/16"	000000	000000
1	40, 80	9	150 psi @ 70° F	2	40° to 140°	Dark Gray	5 3/16"	000000	000000
1 1/4	40, 80	26	150 psi @ 70° F	2	40° to 140°	Dark Gray	6 5/8"	000000	000000
1 1/2	40, 80	45	150 psi @ 70° F	2	40° to 140°	Dark Gray	6 5/8"	000000	000000
2	40, 80	65	150 psi @ 70° F	2	40° to 140°	Dark Gray	7 5/8"	000000	000000

CPVC Plastic Body

For Use With: Citric Acid, Deionized Water, Diesel Fuel, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Mineral Spirits, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Sodium Hypochlorite, Water
Piston Material: CPVC Plastic
Spring Material: CPVC Plastic
Seal Material: Fluoroelastomer Rubber

Socket Connect × Socket Connect
Pipe Size	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.		Each
1/2	40, 80	0.8	150 psi @ 70° F	2	40° to 190°	Light Gray	3 3/8"	0000000	0000000
3/4	40, 80	3	150 psi @ 70° F	2	40° to 190°	Light Gray	4 3/16"	0000000	000000
1	40, 80	9	150 psi @ 70° F	2	40° to 190°	Light Gray	5 3/16"	0000000	000000
1 1/2	40, 80	45	150 psi @ 70° F	2	40° to 190°	Light Gray	6 5/8"	0000000	000000
2	40, 80	65	150 psi @ 70° F	2	40° to 190°	Light Gray	7 5/8"	0000000	000000

Clear-View Socket-Connect Check Valves for Harsh Chemicals

For Use With: Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Hydrochloric Acid, Methanol, Nitric Acid, Phosphoric Acid, Salt Water, Sulfuric Acid, Water
Piston Material: PVC Plastic
Seal Material: Fluoroelastomer Rubber

Visually inspect flow and debris accumulation through the transparent valve body. Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection. Valves have a PVC body and a fluoroelastomer seal for excellent chemical resistance. They open to allow flow in one direction and close when flow stops or reverses. All have a removable cap that provides easy access to internal components for maintenance.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

PVC Plastic Body
Pipe Size	For Pipe Schedule	Flow Coefficient (Cv)	Max. Pressure	Min. Opening Pressure, psi	Temperature Range, °F	Color	End-to-End Lg.	Features		Each
Socket Connect × Socket Connect
1/2	40, 80	6.7	150 psi @ 70° F	0.29	35° to 140°	Clear	5 5/8"	Removable Cap	0000000	000000
3/4	40, 80	11.9	150 psi @ 70° F	0.29	35° to 140°	Clear	6 5/16"	Removable Cap	0000000	00000
1	40, 80	21	150 psi @ 70° F	0.29	35° to 140°	Clear	6 7/8"	Removable Cap	0000000	000000

Dual Shut-Off Threaded Diverting Valves


Female x Male x Male	Female x Female x Female
Female x Male x Male

Valve Type: Ball
For Use With:
NPT Female × NPT Female × NPT Female: Air, Water
NPT Female × NPT Male × NPT Male: Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon
Seal Material: PTFE Plastic

Control flow in two directions from a single source—these valves have two handles for independent operation of each outlet. They can direct flow from the center-port inlet to one side-port outlet at full capacity, direct flow to both side-port outlets simultaneously at reduced capacity, or shut off flow to both outlet ports completely. Valves are standard port, so they slightly restrict flow.

For technical drawings and 3-D models, click on a part number.

Brass Body
Inlet Pipe Size	Outlet Pipe Sizes	Flow Pattern	Max. Pressure	Temp. Range, °F	Vacuum Rating, in. of Hg	End-to-End Lg.		Each
NPT Female × NPT Male × NPT Male
1	3/4 × 3/4	Y-Pattern	600 psi @ 200° F	-40° to 365°	29	3 1/4"	0000000	000000
Bronze Body
NPT Female × NPT Female × NPT Female
1	3/4 × 3/4	Y-Pattern	550 psi @ 150° F	Not Rated	29	3 7/16"	0000000	000000
1 1/4	3/4 × 3/4	Y-Pattern	550 psi @ 150° F	Not Rated	29	3 7/16"	0000000	000000

Air On/Off Valves

Bronze Body

Brass Body

Turn airflow on and off with these valves. They have two balls to independently shut off airflow to one of two outlets from a single source. When closed, they vent air pressure to the atmosphere so you can disconnect air tools safely.

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

For technical drawings and 3-D models, click on a part number.

Number of Ports						Overall
Inlet	Outlet	Inlet Pipe Size	Outlet Pipe Size	Flow Coefficient (Cv)	Temp. Range, °F	Lg.	Wd.	Ht.	Ball Material		Each
NPT Female Inlet × NPT Female Outlet
Bronze Body
1	2	1	3/4	43	-20° to 400°	3 1/2"	10"	2 9/16"	Bronze	0000000	0000000
1	2	1 1/4	3/4	43	-20° to 400°	3 1/2"	10"	2 9/16"	Bronze	0000000	000000
NPT Female Inlet × NPT Male Outlet
Brass Body
1	2	1	3/4	30	-40° to 365°	5 5/8"	8 1/8"	2 13/16"	Chrome-Plated Brass	0000000	00000

Diverting Valves with Fire-Fighting Hose Fittings

Valve Type: Ball
For Use With: Water
Seal Material: Buna-N Rubber

Control the flow of water in two directions from a single source—these diverting valves have two balls and handles for independent operation of each outlet. They can direct flow to one side outlet at full capacity while shutting off flow to the second side outlet, direct flow to both side outlets at reduced capacity, or shut off flow to both side outlets. Valves have a brass body for good corrosion resistance. They are for use with fire-fighting hose.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

NH/NST (National Hose/National Standard) threads are only compatible with other NH/NST threads. Male NPSH (National Pipe Straight Hose) threads are compatible with female NPSH threads. Female NPSH threads are compatible with male NPSH, NPT, NPTF, and NPSM threads.

For technical drawings and 3-D models, click on a part number.

NH/NST Female × NH/NST Male × NH/NST Male

Brass Body
Inlet Fire Hose Trade Size	Outlet Fire Hose Trade Sizes	Flow Pattern	Flow Coefficient (Cv)	Max. Pressure	Temp. Range, °F	End-to-End Lg.		Each
2 1/2	1 1/2 × 1 1/2	Y-Pattern	Not Rated	300 psi @ 150° F	-20° to 150°	5 5/8"	000000	0000000

NPSH Female × NPSH Male × NPSH Male

Brass Body
Inlet Pipe Size	Outlet Pipe Sizes	Flow Pattern	Flow Coefficient (Cv)	Max. Pressure	Temp. Range, °F	End-to-End Lg.		Each
2 1/2	1 1/2 × 1 1/2	Y-Pattern	Not Rated	300 psi @ 150° F	-20° to 150°	5 5/8"	000000	0000000