Wilkins: 1 1/4″ – 2″ –  Rubber Parts Kit for a 975 / 975XL / 975XL2  Reduced Pressure Zone Assembly
 
 
Kit Includes:
Relief Valve Diaphragm, RV Piston O-Ring, RV Seat Disc, 2 Check Discs, and 2 Check Cover O-Rings