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1/2 In Lead Free Anti-Siphon Vacuum Breaker Backflow Preventer
Manufacturer Resources
Product Specs
- Backflow Preventer Type:
- Vacuum Breaker
- Body Finish:
- Brass
- Body Material:
- Lead Free Brass
- Body Pattern:
- Does Not Apply To Product
- Bypass:
- No
- Cap And Tether:
- No
- Disc Material:
- Silicone
- Elbow Fitting:
- No
- Hazard Protection Level:
- Health Hazard
- Hot And Harsh Water:
- No
- Hydrant Connection:
- No
- Inlet Connection Size:
- 1/2 IN
- Inlet Connection Size Metric:
- 15 MM
- Inlet Connection Type:
- Female Threaded
- Inlet Shutoff Valve Type:
- No Shutoff Valve
- Inlet Thread Type:
- NPT
- Maximum Temperature:
- 180°F
- Maximum Temperature Celsius:
- 82
- Maximum Temperature Fahrenheit:
- 180
- Maximum Working Pressure:
- 125
- Maximum Working Pressure Bar:
- 8.6
- Meter Type:
- No Meter
- Minimum Temperature:
- 33°F
- Minimum Temperature Celsius:
- 0.5
- Minimum Temperature Fahrenheit:
- 33
- Outlet Connection Size:
- 1/2 IN
- Outlet Connection Size Metric:
- 15 MM
- Outlet Connection Type:
- Female Threaded
- Outlet Shutoff Valve Type:
- No Shutoff Valve
- Outlet Thread Type:
- NPT
- Polymer Coating:
- No
- Pressure Operation:
- Non Continuous
- Protection Type:
- Backsiphonage
- Seat Material:
- Silicone
- Series:
- LF288A
- Strainer:
- No
- Test Status:
- Non Testable
- Ul Classified Can:
- No
- Ul Classified Us:
- No
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Backflow Preventer
- UL Listing (Specs):
- N-No UL Code Rating
Watts 792038 – Frequently Asked Questions
1) Will the Watts LF288A 1/2 inch vacuum breaker thread onto my 1/2 inch NPT pipe?
Both ends of the LF288A are 1/2 inch female NPT (15 mm), so it threads directly onto 1/2 inch male NPT nipples or adapters on the inlet and outlet. Same size in and out, so there is no reducing built into the body. If your run is copper or PEX, you'll need male NPT adapters at both connections.
2) Can I leave a Watts LF288A anti-siphon vacuum breaker under constant pressure?
No. The LF288A is rated for non-continuous pressure only, which means it must not sit under pressure for more than about 12 hours at a stretch. Downstream of it there should be no shutoff that keeps the device loaded. For an application where the valve stays pressurized around the clock, you need a continuous-pressure device such as a pressure vacuum breaker or an RPZ assembly rather than this atmospheric type.
3) Does the Watts LF288A protect against backpressure or only backsiphonage?
Backsiphonage only. The LF288A stops water being pulled back into the supply when upstream pressure drops, and it is rated for high hazard (health hazard) service on that basis. It will not hold against backpressure, so if the downstream side can be pressurized above the supply, by a pump or an elevated line, this is the wrong device and you want a reduced pressure zone assembly instead.
4) Does the Watts LF288A need annual testing by a certified backflow tester?
The LF288A is a non testable device, so there are no test cocks and no gauge ports on it. Maintenance is inspection and replacement rather than an annual test report. Facilities that need a testable assembly for their cross connection control program should be looking at a testable pressure vacuum breaker or RPZ, not this one.
5) Do I get shutoff valves or a strainer with the Watts LF288A vacuum breaker?
No, and plan the piping around that. The LF288A ships without inlet or outlet shutoffs, without a strainer, without a bypass, without a cap and tether, and without an elbow fitting. If you want to isolate the device for service you have to pipe in your own valve upstream, and remember that a downstream shutoff is not permitted on a non-continuous pressure atmospheric breaker.
6) What temperature and pressure can the Watts 0792038 vacuum breaker handle?
Working range is 33 to 180 degrees F (0.5 to 82 C) at up to 125 psi (8.6 bar). That covers domestic hot water service, but the 33 degree minimum means it cannot be left charged where it may freeze, so outdoor and unheated installations need to be drained down or protected. It is also not built for hot and harsh water duty.
7) Is the Watts 0792038 lead free for potable water?
The body is lead free brass with a brass finish, and the LF prefix on the LF288A series marks it as the lead free version. Internally the disc and seat are silicone. That combination is what you want on a potable line feeding fixtures or equipment.
8) What is the correct part number to order for the 1/2 inch Watts LF288A anti-siphon vacuum breaker?
Order manufacturer part 792038 in the Watts LF288A series, the 1/2 inch lead free anti-siphon vacuum breaker. There is one configuration, so there is no finish or connection option to specify with it.
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Does the Watts 792038 come with a warranty?
Absolutely. The Watts 792038 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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