Watts 774DCDA LF LM 4 Part of the 774DCDA Series silt fence selector 6 BAR at 178 degree 6 BAR at 178 degree C Retainer Cover Material Cast Iron Retainer Cover Type Tapped with Closure Plug Screen Material Stainless Steel Screen Size ONE_SIXTEENTH Seat Material Does Not Apply To Product Series 77F DI FDA 125 Strainer Type Wye WOG Rating 200 PSI Specification Sheet 77F DI 125 This 1 by 1 inch lead free dual check valve backflow preventer helps prevent the reverse flow of polluted water from entering into the drinking water supply at the service entrance or at individual outlets This 4 IN double check detector backflow preventer assembly prevents the backflow of fire protection system substances from being pumped or siphoned into the potable water supply It is designed for installation on applications identified by local authorities as non health hazard