The Complete Repair Kit is compatible with the 2” Model 500XL Pressure Reducing Valve. Repair Kit components include one Cap Washer, Plunger Bolt, Plunger Bolt Washer, Seat Washer, Stem Washer, Stem O-Ring, Stem, Diaphragm, Diaphragm Disc, Diaphragm Bolt, and Spring. Repair Kits are sold as accessories for quick and simple repair needs extending the life of your pressure reducing valve.