... pumps SHINEQUIP offers a complete line of accessories for OEMfluid end modules :Bolts and nuts ,Thread ring ,Upper and lower valve ... Guide ,Liner End Cover ,Valve Pot Cover ,Cylinder Head ,Cylinder Head Plug ,Liner Seal ,Valve Cover Gasket ,Cylinder ... valve-over-valve design reduces the volume in the fluid end and improves the volumetric efficiency.When you order parts, please ...