Febco LF856DCDA OSY CFM 3 Part of the LF856 Series roof hatch finder Durable Construction & Wet Area Compatibility: Durable Construction & Wet Area Compatibility: Engineered with moisture resistant materials built to withstand daily use in wet environments Features Competitor drop in replacement lay length 50 Minimum Temperature Fahrenheit 33 Outlet Connection Size 3 IN Outlet Connection Type Flanged Joint Outlet Shutoff Valve Type Outside Stem And Yoke Gate Valve Part Number 0124439 Polymer Coating No Pressure Operation Does Not Apply To Product Protection Type Backpressure and Backsiphonage Seat Material Stainless Steel Series LF856 Strainer No Tradename MasterSeries Specification Sheet LF856 This 3 inch lead free MasterSeries® double check detector backflow preventer assembly prevents the backflow of pollutants due to backsiphonage and or backpressure that are objectionable but not toxic