CALIBER

Parts for oilfield circulating pumps, namely, valve covers designed specifically for use with circulating pumps and valve cover systems comprised of valves, seals and seats, piston rods and piston rod systems comprised of pistons and seals, liners, liner retainers and liner retention systems comprised of liners and sleeves, all of the foregoing designed specifically for use with circulating pumps; parts for oilfield mud pumps, namely, valve covers and valve cover systems comprised of valves and seats, piston rods and piston rod systems comprised of pistons and seals, liners, liner retainers and liner retention systems comprised of liners and sleeves, all of the foregoing designed specifically for use with circulating pumps; oilfield mud valves being parts of machines