Brass Vacuum-Breaking Valves

	Pipe Size Pipe Size

3/8

1/2

3/4

1 1/4

1 1/2

	Thread Type Thread Type

NPT

GHT

	For Use With For Use With

	Connection Style Connection Style


Threaded	Unthreaded

	Shape Shape


Straight	90° Elbow

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

Any Position

	Maximum Pressure Maximum Pressure

125 psi @ 70° F

300 psi @ 70° F

85 psi @ 140° F

	Gender Gender


Female	Male

	Connection Type Connection Type


Pipe	Tube

Hose

	Maximum Temperature Maximum Temperature

140° F

180° F

365° F

	Connection Connection

Inlet

Outlet

	Minimum Temperature Minimum Temperature

-20° F

30° F

35° F

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

DFARS Specialty Metals
COTS-Exempt

	Fitting Type Fitting Type

Adapter

Connector

	Specifications Met Specifications Met

	Inlet Pipe Size Inlet Pipe Size

1/2

3/4

	Seal Material Seal Material

Silicone Rubber

EPR Rubber

Rubber

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Inlet Connection Type Inlet Connection Type


Pipe	Hose

	For Wall Thickness For Wall Thickness

10"

12"

14"

	Inlet Gender Inlet Gender

Female

Male

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Inlet Thread Type Inlet Thread Type

NPT

GHT

View catalog pages (3)

Forward

How can we improve?

26 Products

About Backflow-Prevention Valves

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.

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

Elbows

For Use With: Water
Seal Material: Silicone Rubber

				Brass Body
Pipe Size	Max. Pressure	Temperature Range, °F	Port-to-Port Lg.		Each
NPT Female Inlet × NPT Female Outlet
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

Straights

NPT Male Inlet ×
NPT Female
Outlet Straight

NPT Male Inlet ×
Unthreaded
Female Outlet

For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
Seal Material: EPR Rubber

						Brass Body
Inlet Pipe Size	Outlet Pipe Size	For Outlet Tube OD	Max. Pressure	Temperature Range, °F	End-to-End Lg.		Each
NPT Male Inlet × NPT Female Outlet
1/2	3/8	__	300 psi @ 70° F	-20° to 365°	1 3/4"	0000000	0000000
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 Inlet × Unthreaded Female Outlet
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

With Set Screw

With Tamper-Resistant Set Screw

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 ASME 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.

					Brass Body		Chrome-Plated Brass Body
Thread Size	Max. Pressure	Temperature Range, °F	End-to-End Lg.	Specifications Met		Each		Each
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, CAN/CSA B64.2, ASME A112.1.3	00000000	000000	00000000	000000
3/4"	125 psi @ 70° F	30° to 180°	1 1/2"	ASSE Standard 1011, Uniform Plumbing Code, CSA Certified, CAN/CSA B64.2, NSF/ANSI 372, ASME A112.1.3	00000000	00000	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, CAN/CSA B64.2, ASME A112.1.3	00000000	00000	00000000	00000
3/4"	125 psi @ 70° F	30° to 180°	1 1/2"	ASSE Standard 1011, Uniform Plumbing Code, CSA Certified, CAN/CSA B64.2, NSF/ANSI 372, ASME A112.1.3	00000000	00000	00000000	00000

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	ASSE 1011, CSA Certified, CAN/CSA B64.2, ASME A112.1.3	00000000	000000