3-web or 4-web Valve and Seat for Mud pump expendables 1. We are factory 2. In ... stock 3. Interchangeable 3-web or 4-web Valve and Seat for Mud pump expendablesWe supply products include as following:High- ... Piston,Piston Hub,Piston Rod,Plate,Snap Ring,Upper and Lower valve Guide,Extension Rod,Piston Rod Clamp,Threaded ... (Fluid ends),Ceramic Liner. API standard National Type Valve and Seat for Mud Pump