Watts 994 DOSY 10 Part of the 994 Series detectable warning mat finder This 2 1 2 inch reduced This 2 1 2 inch reduced pressure detector backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements 00 Minimum Temperature Fahrenheit 0 Operating Torque Does Not Apply To Product Outlet Connection Size 2 IN Outlet Connection Type Socket Outlet Thread Type Does Not Apply To Product Part Number 0555133 Port Type Full Seat Material Virgin PTFE Series LFFBV 4 Stem Packing Material Virgin PTFE Stem Shaft Material Brass Stem Type Bottom Loaded Blowout Proof Thrust Washer Material Virgin PTFE Valve Style 2 piece WOG Rating 600 PSI Specification Sheet LFFBV 4 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 Bottom mounted relief valve reduces clearance requirements when installed against an outside wall