... -acting 4.Bi-acting and sulfuration produce PISTON ASSEMBLY For Triplex and Duplex mud Pumps Piston cores are made ... manufactured to API 7K quality standards. Parts are available for these popular pump models:Emsco:F-1300, F-1600, ... 1700-PT/A-1400-PTAnd other brand spare parts for WIRTH, OPI, Ellis Williams, Wilson, Gaso, Skytop/Brewster ... feel free to send me an inquiry piston assy for mud pump parts