Watts 0792037 3/8 In Lead Free Anti-Siphon Vacuum Breaker Backflow Preventer

Both ends are 3/8 inch (10 mm) female NPT threads, inlet and outlet. So it threads onto male NPT pipe nipples or adapters on each side. There are no shutoff valves built into either end, so if you need isolation for service you have to pipe a stop in ahead of it.

No. The LF288A is rated for non-continuous pressure only, meaning it must not be under constant supply pressure for extended periods. Install it downstream of the control valve so it only sees pressure while the fixture or equipment is running. If the application keeps pressure on the device around the clock, you need a continuous-pressure type device instead, such as a pressure vacuum breaker or an RPZ.

Backsiphonage only. It is a vacuum breaker, so it breaks a siphon when supply pressure drops, but it will not stop backpressure from a pump, elevated piping, or a thermal expansion source pushing water back into the supply. If your cross connection can be pressurized from the downstream side, this is the wrong device.

No, the LF288A is a non-testable device. There are no test cocks and no field test procedure, so there is nothing for a certified backflow tester to hook a gauge to. Maintenance is inspection and replacement rather than testing. If your jurisdiction is demanding an annually tested assembly on the connection, you need a testable assembly, not this one.

The LF288A is rated for health hazard (high hazard) protection against backsiphonage, so it covers contaminant-level cross connections and not just aesthetic ones. The limit is the type of backflow, not the hazard level: it handles siphonage only, and only where the line is not under continuous pressure.

The body is lead free brass, which is what lets it be used on potable water lines under lead free plumbing requirements. Wetted soft parts are silicone for both the disc and the seat.

125 psi (8.6 bar) maximum working pressure, with a temperature range of 33 to 180 degrees F (0.5 to 82 C). That 180 F ceiling covers normal domestic hot water, but it rules out steam and boiler feed service, and the 33 F low end means it can't be left in a line that freezes.

It's a bare device. No strainer, no inlet or outlet shutoff, no bypass, no meter, no cap and tether, and no elbow fitting. Plan on supplying your own stop valve and any strainer the equipment needs as separate line items when you build the job material list.

For ordinary hot water up to 180 F, yes. But it is not built for hot and harsh water service, it has no polymer coating on the body, and the seals are silicone. Aggressive or chemically treated water is outside what this one is specified for, so pick a device rated for harsh service in those applications.