Watts 740 040 FS 1 - Part of the 740 Series ZA100F-8NH while heavy-duty clamps keep the

while heavy-duty clamps keep the frame securely in place

top of stair landings

Fits 1/4 IN to 1 IN backflow

Ideal for both residential and commercial wet spaces—such as bathrooms

Membrane Clamp & Debris Protection: Includes a flashing clamp that secures the roofing membrane along with a guard or strainer to keep out gravel

Watts 740 040 FS 1 - Part of the 740 Series ZA100F-8NH while heavy-duty clamps keep theThis pressure relief valve has a 1 inch NPTF female inlet, 1 1 4 inch NPTF female outlet, and pressure relief setpoint of 40 psi. The valve can be used for hot water space heating boiler applications to protect against excessive pressure. It features an iron body, non metallic disc to metal seating, and test lever. Includes a nonrestrictive discharge drain line flood sensor with SentryPlus Alert technology to detect excessive water discharges from the