... maintaining high mechanical properties. A unique anti-extrusion feature, coupled with a premium elastomer, improves service life while reducing downtime and ... -P-160,8-P-80,7-P-50,K-700,K-700A,K-500,K-500A,K-380,A1700-PT,A1400-PT,A1100-PT,220P ... WILLIAMS :W-440-LP,WILSON600,PPWH. EMSCO mud pump pistons with replacement rubber