Total Rubber Parts Repair Kit For 4 In Lead Free Reduced Pressure Zone Assembly, 909_This total rubber parts kit is used for replacing or repairing the relief valve assembly on a 4 inch lead free reduced pressure zone assembly series 909 used to prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure. This kit consists of a diaphragm, two molded disc assemblies, two seat O-rings, RV O-ring, two piston O-rings, RV stem O-ring, flow tube O-ring and cover O-ring._Fits 4 IN reduced pressure zone assembly_Factory replacement parts_Check disc, stem O-Ring, sleeve O-Ring_Relief valve disc assembly, piston seal, piston O-Ring_Specifications_ADA Compliant N_Brand Watts_Kit Contents Check Disc, Cover O-Ring, Sleeve O-Ring, Piston O-Ring, Rv Disc Assembly, Diaphragm, Piston Seal And Lubricant_Kit Type Complete Rubber Parts Kit_Lead Free YES_Part Number 0794090_Product Group BACKFLOW KITS_Products Used On LF909, 909_Products Used On Size 4 IN_Series RK-LF909