Watts 0391006 1 1/2 In Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Lever Handles

Both ends are 1-1/2 inch female NPT threaded, inlet and outlet. You thread it onto male NPT nipples or male adapters at each end. No flanges, no grooved ends, no unions supplied, so plan for male-threaded transitions off your 1-1/2 inch line.

A reduced pressure zone assembly is what you use where a health hazard is involved, meaning contamination that could make someone sick rather than just degrade water quality. The LF009 is rated for health hazard protection and guards against both backpressure and backsiphonage. A double check is only acceptable on non-health-hazard (pollution) cross connections. If your local authority has classified the connection as high hazard, an RPZ like this is the assembly they will expect.

Yes. The body is lead free bronze, which is what makes it acceptable on potable water systems subject to lead free requirements. It is also cast bronze bodied and made in the United States, which matters if your job carries a domestic sourcing clause.

It is rated for continuous pressure operation, so it can sit under line pressure indefinitely rather than being limited to intermittent duty. Maximum working pressure is 175 psi. It also carries a UL classification for the US market, which is the listing fire protection inspectors look for on a sprinkler supply. There is no Canadian UL classification on it.

33 degrees F to 180 degrees F (0.5 C to 75 C). That covers domestic cold water and tempered service, but it is not a hot or harsh water assembly, so keep it off high-temperature boiler feed and process lines. Because the low end is just above freezing, it needs to be installed where it will not freeze, or in a heated enclosure if outdoors.

No strainer is included. On dirty or older mains, debris getting to the check seats is the usual cause of nuisance relief discharge, so many installers add a wye strainer ahead of the inlet shutoff. Order it separately in 1-1/2 inch NPT to match the inlet.

Yes, it is a testable assembly, so a certified tester can run the annual test most jurisdictions require on an RPZ. Leave clearance around the test cocks and the relief valve when you set it, and keep an air gap drain under the relief port.

Quarter turn ball valves with lever handles on both the inlet and outlet, so you can close either side by hand in a quarter turn to isolate the assembly for testing or repair. No gate valves and no handwheels to fight with in a tight pit.

Neither. It is a straight inline pattern assembly with no bypass line and no meter. If your service needs continuous water during testing, the bypass has to be piped externally with its own approved assembly. Same with metering, which is a separate device upstream or downstream.

Silicone discs on engineered plastic seats. Those are the wear parts a tester replaces when a check fouls or fails, and silicone holds up better than rubber against chlorinated potable water.

Yes. The manufacturer part number is 391006, and it is the LF009 series reduced pressure zone assembly in 1-1/2 inch with quarter turn ball valve shutoffs and lever handles. That is the number to give a supplier or put on a submittal.