... stock 3. Interchangeable 3-web or 4-web Valve and Seat for Mud pump expendablesWe supply products include as following:High-chrome ... web Valve and Seat,Full-open Valve and Seat (KQ/G2/FO),Valve Spring,Long-life Bonded Piston with RubbersFabric Long-life Bonded Piston ... with Urethane,Replacement Piston,Piston Hub,Piston Rod,Plate,Snap Ring,Upper and Lower valve ...