Profile: Retsco Ltd. specializes in the manufacture of reset relief valves for the oil field industry. Our product line comprises of tilting disc wafer check valves, lancaster drilling & production chokes, shear valves, mud gauges, float valves, solids control equipment & mud hoppers and mud guns. Our bottom type mud guns are designed for sub merged service in steel pits. Our gauge provides quick, accurate response to pressure changes and minimizes fluctuations with a built-in dampening mechanism.