Watts 957NRPDA BFG GPM FS 6 Part of the 957RPDA Series Window Well Extension ZN400J 3NL ZN400J 3NL This check cover repair kit is used to repair or replace the first or second check on a 1 2 inch lead free double check valve assembly and used to protect drinking water supplies from dangerous cross connections in accordance with national plumbing codes and water authority requirements This backflow assembly contains a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve 50 Minimum Temperature Fahrenheit 33 Outlet Connection Size 6 IN Outlet Connection Type Grooved Joint Outlet Shutoff Valve Type Gear Operated Butterfly Valve Outlet Thread Type Does Not Apply To Product Part Number F111665 Polymer Coating No Pressure Operation Continuous Protection Type Backpressure and Backsiphonage Seat Material EPDM Series 957RPDA Strainer No Technologies Flood Detection Tradename None Specification Sheet 957RPDA