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Armstrong Machine of Pocahontas, Iowa, has been a leading manufacturer of high quality super liners, mud pump liners, mud pump parts, and custom heat-treating since 1974. Our product offering is extensive, including Hydraulic Driven Grout Pumps, Gardner-Denver Duplex Pumps, Triplex Pumps, Hardened Slush Pump Valves, Mud Pump Liners and Parts, along with so much more.