Watts LF009M2-QT 1 1/2 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 (40 mm), inlet and outlet alike. So you thread into male NPT nipples on each side. There's no elbow fitting and no strainer included, so if the supply needs a strainer or a change of direction, plan those as separate fittings.

Yes. The LF009M2-QT is a reduced pressure zone assembly rated for health hazard protection, and it guards against both backpressure and backsiphonage. That is the combination you need where a cross connection could carry something harmful back into potable water, which is where a double check assembly is not enough.

Yes, the body is lead free cast bronze and the assembly is flagged lead free, which is what a potable water installation in a commercial or multifamily building needs. Internals use a silicone disc and engineered plastic seat.

Shutoffs are included on both ends. The QT suffix means quarter turn ball valves with lever handles on the inlet and the outlet, so the assembly arrives as a complete kit ready to isolate for testing.

It is. Pressure operation is continuous, with a maximum working pressure of 175 psi (12 bar), so it can sit under constant line pressure on a domestic or irrigation feed rather than intermittent duty only.

33 F to 180 F is the operating range on the LF009M2-QT. It is not built for hot or harsh water service, so keep it off recirculating hot water and boiler feed lines running above that. Freeze protection still matters at the low end, since 33 F leaves no margin in an unheated space.

No. The LF009M2-QT is a plain inline assembly with no bypass, no meter, and no cap and tether. If your jurisdiction or fire service requires a metered bypass around the assembly, that has to be a separate configuration.

Yes, it is listed as Buy American Act compliant, country USA, which is what federal, school, and municipal procurement typically needs on the submittal. Order it by Watts model LF009M2-QT 1 1/2, part number 391006.

Go by the hazard. A reduced pressure zone assembly like the LF009 is the one approved for health hazard (high hazard) cross connections, covering backpressure and backsiphonage, and it has a relief port that discharges when the check seals fail, so it needs an air gap drain and cannot go in a pit that could flood. A double check assembly is for non health hazard service only and has no relief discharge, which is why it is often chosen where drainage is impossible.