Watts 994 LF 4 Part of the 994 Series silt fence selector ZN1910 3NH ZN1910 3NH 00 Minimum Temperature Fahrenheit 33 Outlet Connection Size 2 IN Outlet Connection Type Press Outlet Shutoff Valve Type Quarter Turn Ball Valve Outlet Thread Type Does Not Apply To Product Part Number 0391031 Polymer Coating No Pressure Operation Continuous Protection Type Backpressure and Backsiphonage Seat Material Stainless Steel Series LF009 Strainer No Technologies Does Not Apply To Product Tradename None Field Guide Backflow Preventer Repair Parts 007 and 009 Assembled without shutoff valves It is ideal for protection in continuous pressure piping applications and at cross connections identified as health hazards and from other contaminants found at the service line entrance