Straight Wyes | McMaster-Carr

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	Pipe Size Pipe Size

1/4

	Thread Type Thread Type

NPT

	Connection Style Connection Style

	Threaded
	Socket Connect
	Solder Connect

	For Use With For Use With

	Body Material Body Material

Bronze

Plastic

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

Any Position

	Check Valve Type Check Valve Type

Swing

Spring-Loaded Piston

Piston

	Seal Material Seal Material

Rubber

Bronze

Brass

	Valve Type Valve Type

Check

	Connection Type Connection Type


Pipe	Tube

	Maximum Pressure Maximum Pressure

	Shape Shape	Show

	Straight

	Shape Shape	Hide


Wye	Double Wye

Tee	Straight

	Pressure Class Pressure Class

	Gender Gender

Female

Male

	Maximum Temperature Maximum Temperature

Less than 200° F

300° to 499° F

500° F or greater

	Minimum Opening Pressure Minimum Opening Pressure

0.29 psi

0.5 psi

2 psi

	Connection Connection

Inlet

Outlet

	Actuation Actuation

Pressure

	Disc Material Disc Material

Bronze

Brass

	Valve Function Valve Function

Backflow Prevention

	Fitting Type Fitting Type

Connector

	System of Measurement System of Measurement

Inch

	End-to-End Length End-to-End Length

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

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65 Products

About Backflow-Prevention Valves

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—150 Pressure Class
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	00000	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—200 Pressure Class
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	00000	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	00000	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	00000	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	00000
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
3	240	400 psi @ 150° F	200 psi @ 388° F	0.5	-20° to 550°	Bronze	Bronze	7 7/8"	Removable Cap	0000000	00000000	00000000	00000000
NPT Female × NPT Female—300 Pressure Class
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	00000	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	00000	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	00000	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	00000
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
3	240	600 psi @ 150° F	300 psi @ 422° F	0.5	-20° to 550°	Bronze	Bronze	7 7/8"	Removable Cap	0000000	00000000	00000000	00000000

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	00000
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

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

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
3/4	40, 80	3	150 psi @ 70° F	2	40° to 140°	Dark Gray	4 3/16"	000000	0000000
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 1/4	40, 80	26	150 psi @ 70° F	2	40° to 190°	Light Gray	6 5/8"	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	00000