Fluid Section Service Kit Model Number 612999-6, Includes (2) Balls, (2) Diaphragm, (2) Duckbill Valves, (2) O-Ring - 1/2 in Non-Metallic and 2 in Metallic PD20X-X, (4) O-Ring - 1/2 in Metallic and Non-Mettalic, (4) O-Ring - 1/2 in Non-Metallic, Grease Packet, O-Ring - 1/2 in Metallic and Non-Metallic, Operators Manual.