Description It has never occurred to Kerr Machine to stop pumping. The company, which does business as Kerr Pumps, makes plunger and piston pumps for customers in a range of industries. The company's pumps are positive displacement reciprocating pumps, which are used in virtually every industrial and oilfield application. Kerr Machine manufactures simplex, duplex, triplex, quintuplex, and sextuplex plunger and piston pumps for moving liquids under pressure. Applications include agriculture pumps, cement slurry pumps, food processing pumps, mud pumps, oil and gas pumps, and salt water disposal pumps. The company has installed more than 30,000 pumps, about a third of which are located at international sites.