Watts 0111603 3 In SS Reduced Pressure Zone Assembly Backflow Preventer, NRS Shutoff Valves

Both ends are 3 inch (80 mm) flanged joints, inlet and outlet. You are landing it on companion flanges with gaskets and bolts, so plan for flange adapters if the run is grooved or threaded. It is an inline body pattern, meaning inlet and outlet sit on the same axis rather than stepping up or over.

Non rising stem gate valves on both the inlet and the outlet. NRS is what you want where headroom is tight or the assembly sits in a vault or meter pit, since nothing travels upward when the valve opens. If your local authority or a fire service tie-in specifically calls for OS&Y so the valve position is visible, this is not the right build of the 957.

It is not UL Classified, so it should not be used where the authority having jurisdiction requires a UL/FM listed assembly on a fire service line. Use it on domestic, irrigation, and process water instead, and order a UL listed RPZ for sprinkler mains.

It is rated for continuous pressure operation, so it can stay pressurized 24/7 on a domestic or process supply without duty cycling. Maximum working pressure is 175 psi, which covers most municipal supplies; anything above that needs a pressure reducing valve upstream.

Service range runs 33 F (0.5 C) up to 140 F (60 C). That covers cold domestic and tempered water, but it rules out hot water returns or boiler loops running above 140 F, and the 33 F floor means it has to be installed where it cannot freeze. Heated enclosure or indoor install in cold climates.

No strainer ships with this assembly. On dirty, older, or recently disturbed mains, debris hanging up a check disc is the usual cause of a nuisance relief discharge, so most installers order a separate flanged wye strainer for the inlet side and add its face-to-face length to the pipe layout.

Neither. The 0111603 is a straight assembly with no bypass and no meter. If the building cannot tolerate a shutdown for annual testing or repair, the bypass has to be piped separately with its own approved assembly, and any irrigation or make-up metering has to be provided as a separate device.

Yes, it is a testable assembly, which is what annual certification by a licensed backflow tester requires. Test cocks are part of the assembly, and the tester gauges the two check valves and the relief valve against them.

Stainless steel body and stainless finish, with silicone check discs and engineered plastic seats. Stainless avoids the dezincification and lead concerns that come with brass or bronze bodies and holds up better on aggressive or chloraminated water, which is why spec writers often call it out over a cast iron epoxy-coated assembly on potable domestic service.

Country of origin on the 0111603 is the United States, which is what public agency, school district, and federally funded projects typically need documented on the submittal.