The Red-White Valve Corp. Series 937MESL/938 MESL butterfly valves manufactured by Red-White Valve Corp. are made with high-quality stainless steel discs and EPDM seat material. The stainless disc makes this valve the logical choice for adverse water conditions that may have an effect on typical aluminum, bronze and ductile-iron disc material. This along with the added tensile strength of the ductile body puts this series of valves high on the list of the engineers’ choice, Red-White Valve notes.