Cat Pump Piston Kit number 30860 piston repair and replacement, using the 30860 Piston Kit Includes:Inlet Valve, 27004 (3)Piston, 30543 (3)Bac-Cup Ring, 30544 (3)Piston Cup, 43172 (3)V-Hot Cup, 29089 (3)Piston Spacer, 27983 (3)Piston Retainer, 27002 (3)Conical Washer – M6, 27006 (3)Slotted Nut – M6, 27000 (3)Cotterpin – M1.6×10, 14158 (3)Cylinder O-Ring – 70D, 23172 (6)Cylinder Backup Ring, 21985 (3)Cup Insert, 22130 (1)If you are not sure if this is the correct kit, just send a message.