Watts LF288A 1/2 1/2 In Lead Free Anti-Siphon Vacuum Breaker Backflow Preventer

No. The LF288A is rated for non-continuous pressure, meaning it cannot sit under line pressure for more than 12 hours at a stretch. That rules out installing it upstream of a normally closed valve or on a line that stays charged. If the downstream valve stays shut and the device holds pressure continuously, you need a pressure vacuum breaker or an RPZ instead, not an atmospheric type like this one.

Backsiphonage only. The LF288A is a vacuum breaker built to stop a negative pressure event from pulling water back into the potable supply. It does nothing about backpressure, so if the downstream system can push water back at higher than supply pressure (a booster pump, elevated tank, or a boiler loop), this is the wrong device and you want a reduced pressure zone assembly.

Health hazard. The LF288A carries a health hazard protection level, which covers high hazard backsiphonage connections, not just aesthetic or low hazard ones. Common uses in that band are chemical dispensers, janitor sinks, and hose connections to equipment where the downstream fluid is more than a nuisance.

The body is lead free brass, and the part is flagged lead free, which is what a plumbing inspector looks for on a potable water line. Internals are silicone on both the disc and the seat. One thing to know for federal or state funded jobs: this one is not Buy American Act compliant, so if the spec calls for domestic sourcing it will not clear.

Yes. The LF288A ships with no inlet shutoff and no outlet shutoff, no strainer, and no bypass. If your local code or your maintenance plan wants isolation for servicing, order 1/2 inch NPT ball valves separately and thread them to the female NPT ends. Nothing about the device provides isolation on its own.

It comes down to what can push water backward. An anti-siphon vacuum breaker such as the LF288A handles backsiphonage on a health hazard connection, under non-continuous pressure, downstream of the last shutoff. An RPZ is what you install when the connection sees backpressure, when it stays pressurized around the clock, or when the authority having jurisdiction requires a testable assembly with shutoffs and test cocks. The LF288A has no shutoffs and no bypass, which is normal for this class of device and also why it does not substitute for a testable assembly.

Order it as Watts LF288A 1/2. The manufacturer part number is 792038, the series is LF288A, and the size designation 1/2 refers to the 1/2 inch NPT connections on both ends. There is one configuration of this device, so there is no finish, thread, or connection option to specify on the order.

Up to 180 F and 125 psi working pressure, which is 8.6 bar. The low end is 33 F, just above freezing, so it is not a device to leave in a line that can freeze. Residential and light commercial supply pressure sits well inside 125 psi, but if the building runs high and has no PRV, check the static pressure before installing.

Not on harsh water. The LF288A is not the hot and harsh water version of the series, so deionized, treated, or chemically aggressive water and sustained high temperature service call for a different model. Its temperature ceiling is 180 F, which covers ordinary domestic hot water, but the silicone disc and seat are the limiting parts on anything more aggressive than that.

Neither. The LF288A has no cap and tether and no polymer coating, so what you get is the bare lead free brass body with a brass finish. For an exposed outdoor or wash-down install where a coated body is specified, this is not the variant to order.