Febco LFFRK 860 80V VT 2 1 2 10 RV Part of the RK LF860 LF866 LF880V LF886V Series Window Well Cover Cover O ring Kit Type Complete Cover O ring Kit Type Complete Rubber Parts Kit Lead Free YES Product Group BACKFLOW KITS UPC 098268374346 This 1 inch lead free reduced pressure zone backflow preventer assembly with its exclusive design incorporating the patented air in and water out principle for protection during an emergency condition prevents the flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements Fits 2 1 2 to 10 inch double check valve assembly and double check detector assembly This relief valve module kit is used to repair the internal relief valve module of a 2 1 2 to 10 inch reduced pressure zone assembly