Valve kit includes new valves for a plunger pump. It's used with CAT Pumps 310, 340, 350, and 5CP model pumps. Includes (3) Spring Retainer, (3) Valve Spring, (3) Valve, (3) Valve Seat, (3) O-Ring, Valve Seat, Buna-N (3) Back-up Ring and (3) O-Ring, Valve Plug, Buna-N