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About Backflow-Prevention Valves
More
Vacuum-Breaking Valves
Also known as vacuum breakers, these valves have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping.
Chrome-plated bronze valves are more corrosion resistant than brass valves.
303 stainless steel valves have the best corrosion resistance.
Elbows are designed for intermittent flow. They discharge liquid directly and should not be installed in areas where spillage could cause damage.
Straights are often used with steam coils, heat exchangers, and space heaters.
- For Use With: Water
- Seal Material: Silicone Rubber
| Pipe Size | Max. Pressure | Temperature Range, °F | Port-to-Port Lg. | Each | |
Brass Body | |||||
|---|---|---|---|---|---|
NPT Female × NPT Female | |||||
| 1/2 | 125 psi @ 70° F | 35° to 180° | 1 5/16" | 00000000 | 000000 |
| 3/4 | 125 psi @ 70° F | 35° to 180° | 1 1/2" | 00000000 | 00000 |
| 1 | 125 psi @ 70° F | 35° to 180° | 1 5/8" | 00000000 | 00000 |
| 1 1/4 | 125 psi @ 70° F | 35° to 180° | 2" | 00000000 | 000000 |
| 1 1/2 | 125 psi @ 70° F | 35° to 180° | 2 1/4" | 00000000 | 000000 |
| 2 | 125 psi @ 70° F | 35° to 180° | 2 3/4" | 00000000 | 000000 |
Chrome-Plated Bronze Body | |||||
NPT Female × NPT Female | |||||
| 1/4 | 125 psi @ 70° F | 35° to 180° | 1" | 0000000 | 00000 |
| 3/8 | 125 psi @ 70° F | 35° to 180° | 1" | 0000000 | 00000 |
| 1/2 | 125 psi @ 70° F | 35° to 180° | 1 1/4" | 0000000 | 00000 |
| 3/4 | 125 psi @ 70° F | 35° to 180° | 1 1/2" | 0000000 | 00000 |
NPT Female
Straight
Unthreaded
Female Straight
- For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
- Seal Material: EPR Rubber
| Inlet Pipe Size | Outlet Pipe Size | For Outlet Tube OD | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body | |||||||
|---|---|---|---|---|---|---|---|
NPT Male × NPT Female | |||||||
| 1/2 | 3/8 | __ | 300 psi @ 70° F | -20° to 365° | 1 3/4" | 0000000 | 000000 |
| 3/4 | 1/2 | __ | 300 psi @ 70° F | -20° to 365° | 2 1/8" | 0000000 | 000000 |
| 1 | 3/4 | __ | 300 psi @ 70° F | -20° to 365° | 2 3/8" | 0000000 | 000000 |
NPT Male × Unthreaded Female | |||||||
| 1/2 | __ | 11/16" | 300 psi @ 70° F | -20° to 365° | 1 3/4" | 0000000 | 00000 |
| 3/4 | __ | 13/16" | 300 psi @ 70° F | -20° to 365° | 2 1/8" | 0000000 | 000000 |
| 1 | __ | 1 1/16" | 300 psi @ 70° F | -20° to 365° | 2 3/8" | 0000000 | 000000 |
303 Stainless Steel Body | |||||||
NPT Male × NPT Female | |||||||
| 1/2 | 3/8 | __ | 300 psi @ 70° F | -20° to 365° | 1 3/4" | 0000000 | 000000 |
| 3/4 | 1/2 | __ | 300 psi @ 70° F | -20° to 365° | 2 1/8" | 0000000 | 000000 |
| 1 | 3/4 | __ | 300 psi @ 70° F | -20° to 365° | 2 3/8" | 0000000 | 000000 |
NPT Male × Unthreaded Female | |||||||
| 1/2 | __ | 11/16" | 300 psi @ 70° F | -20° to 365° | 1 3/4" | 0000000 | 000000 |
| 3/4 | __ | 13/16" | 300 psi @ 70° F | -20° to 365° | 2 1/8" | 0000000 | 000000 |
| 1 | __ | 1 1/16" | 300 psi @ 70° F | -20° to 365° | 2 3/8" | 0000000 | 000000 |
Vacuum-Breaking Valves with Garden-Hose Fittings
- For Use With: Air, Water
- Seal Material: Rubber
Prevent dirty, contaminated water from backing up into your garden hose line—install these valves between a faucet and a garden hose. Also known as vacuum breakers, 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 ANSI A112.1.3, which assumes the valves will not be used for more than 12 hours at a time.
Chrome-plated brass valves are more corrosion resistant than plain brass valves.
Valves with tamper-resistant set screws have a head that breaks off after tightening to prevent valve removal after installation.
Valves that meet NSF/ANSI Standard 372 are certified lead free.
| Thread Size | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Specifications Met | Each | |
Brass Body | ||||||
|---|---|---|---|---|---|---|
GHT Female × GHT Male | ||||||
With Set Screw | ||||||
| 3/4" | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, Uniform Plumbing Code, CSA Certified B64.2, ANSI A112.1.3 | 00000000 | 000000 |
| 3/4" | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, Uniform Plumbing Code, CSA Certified B64.2, ANSI A112.1.3, NSF/ANSI Standard 372 | 00000000 | 00000 |
With Tamper-Resistant Set Screw | ||||||
| 3/4" | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, Uniform Plumbing Code, CSA Certified B64.2, ANSI A112.1.3 | 00000000 | 00000 |
| 3/4" | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, Uniform Plumbing Code, CSA Certified B64.2, ANSI A112.1.3, NSF/ANSI Standard 372 | 00000000 | 00000 |
Chrome-Plated Brass Body | ||||||
GHT Female × GHT Male | ||||||
With Set Screw | ||||||
| 3/4" | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, Uniform Plumbing Code, CSA Certified B64.2, ANSI A112.1.3 | 00000000 | 00000 |
| 3/4" | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, Uniform Plumbing Code, CSA Certified B64.2, ANSI A112.1.3, NSF/ANSI Standard 372 | 00000000 | 00000 |
With Tamper-Resistant Set Screw | ||||||
| 3/4" | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, Uniform Plumbing Code, CSA Certified B64.2, ANSI A112.1.3 | 00000000 | 00000 |
| 3/4" | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, Uniform Plumbing Code, CSA Certified B64.2, ANSI A112.1.3, NSF/ANSI Standard 372 | 00000000 | 00000 |
High-Pressure Vacuum-Breaking Valves
- For Use With: Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon
- Seal Material: Fluoroelastomer Rubber
Rated for 12 times the pressure of standard vacuum-breaking valves, these can handle up to 1,500 psi. Also known as vacuum breakers, they have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping. Body is 316 stainless steel for excellent corrosion resistance.
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.
Vacuum-Breaking Valves for Chemicals
A plastic body withstands pH neutralizing, cleaning, and plating solutions containing sodium hydroxide, methyl ethyl ketone, and other harsh chemicals. Also known as vacuum breakers, these valves have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping.
- For Use With: Air, Ammonia, Argon, Beverage, Carbon Dioxide, Chlorinated Water, Diesel Fuel, Drinking Water, Ethylene Glycol, Food, Helium, Hydrochloric Acid, Kerosene, Krypton, Liquid Carbon Dioxide, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oil, Oxygen, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Water, Xenon
- Diaphragm Material: Fluoroelastomer Rubber
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | For Pipe Schedule | Max. Pressure | Min. Opening Pressure, psi | End-to-End Lg. | Color | Temperature Range, °F | Each | |
PVC Plastic Body | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Male × NPT Male | ||||||||
| 1/2 | 80 | 100 psi @ 75° F | 1 | 4 5/16" | Gray | 40° to 140° | 000000 | 0000000 |
| 3/4 | 80 | 100 psi @ 75° F | 1 | 4 5/8" | Gray | 40° to 140° | 0000000 | 000000 |
| 1 | 80 | 100 psi @ 75° F | 1 | 5 1/8" | Gray | 40° to 140° | 0000000 | 000000 |
CPVC Plastic Body | ||||||||
NPT Male × NPT Male | ||||||||
| 1/2 | 80 | 100 psi @ 75° F | 1 | 4 5/16" | Light Gray | 40° to 180° | 0000000 | 000000 |
| 3/4 | 80 | 100 psi @ 75° F | 1 | 4 5/8" | Light Gray | 40° to 180° | 0000000 | 000000 |
| 1 | 80 | 100 psi @ 75° F | 1 | 5 1/8" | Light Gray | 40° to 180° | 0000000 | 000000 |
- For Use With: Air, Ammonia, Argon, Beverage, Carbon Dioxide, Chlorinated Water, Diesel Fuel, Drinking Water, Ethylene Glycol, Food, Helium, Hydrochloric Acid, Kerosene, Krypton, Liquid Carbon Dioxide, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oil, Oxygen, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Water, Xenon
- Piston Material:
PVC Plastic Body: PVC Plastic
CPVC Plastic Body: CPVC Plastic - Spring Material: Plastic Polymer
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | For Pipe Schedule | Max. Pressure | Min. Opening Pressure, psi | End-to-End Lg. | Color | Temperature Range, °F | Each | |
PVC Plastic Body | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Male × NPT Male | ||||||||
| 1 1/2 | 80 | 100 psi @ 75° F | 1 | 7 15/16" | Gray | 40° to 140° | 0000000 | 0000000 |
| 2 | 80 | 100 psi @ 75° F | 1 | 8 1/2" | Gray | 40° to 140° | 0000000 | 000000 |
CPVC Plastic Body | ||||||||
NPT Male × NPT Male | ||||||||
| 1 1/2 | 80 | 100 psi @ 75° F | 1 | 7 15/16" | Light Gray | 40° to 180° | 0000000 | 000000 |
| 2 | 80 | 100 psi @ 75° F | 1 | 8 1/2" | Light Gray | 40° to 180° | 0000000 | 000000 |
Through-Wall Frostproof Faucets with Garden Hose Outlet
These faucets drain when closed to prevent freezing. Inlet is dual threaded.
Inlet | |||||||
|---|---|---|---|---|---|---|---|
| For Wall Thick. | Pipe Size (Gender) | Thread Type | Max. Pressure | Temp. Range, °F | For Use Outdoors | Each | |
Brass with Copper Pipe | |||||||
Style A with Vacuum Breaker | |||||||
| 6" | 1/2 (Female), 3/4 (Male) | NPT | 85 psi @ 140° F | 35° to 140° | Yes | 0000000 | 000000 |
| 8" | 1/2 (Female), 3/4 (Male) | NPT | 85 psi @ 140° F | 35° to 140° | Yes | 0000000 | 00000 |
| 10" | 1/2 (Female), 3/4 (Male) | NPT | 85 psi @ 140° F | 35° to 140° | Yes | 0000000 | 00000 |
| 12" | 1/2 (Female), 3/4 (Male) | NPT | 85 psi @ 140° F | 35° to 140° | Yes | 0000000 | 00000 |
| 14" | 1/2 (Female), 3/4 (Male) | NPT | 85 psi @ 140° F | 35° to 140° | Yes | 0000000 | 00000 |
Frostproof Vacuum-Breaking
Valves 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ht. | Thread Size | Thread Type | Gender | Thread Size | Thread Type | Gender | Max. Pressure | Temp. Range, °F | For Use Outdoors | Specifications Met | Each | |
Brass | ||||||||||||
| 2" | 3/4" | GHT | Female | 3/4" | GHT | Male | 125 psi @ 70° F | 35° to 180° | Yes | ANSI A112.1.3, ASSE 1011, CSA Certified B64.2 | 00000000 | 000000 |