... The DM Gate Valve Interchangeable with Demco Model DM Gate Valve, are solid gate, rising stem, gate valves API6A standards. (Interchangeable with Demco Model DM ... Gate Valve)The DM Gate Valve, are solid gate, rising stem, gate valves ... Chemicals Drilling Chemicals Water Flood Lines Abrasive Drilling Mud. DEMCO DM GATE VALVE