Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MDR-1 ELEMENT 137-1400-05 found under Valve Regulating Temperature by Leslie Controls Inc. The National Stock Number assigned to this part is 4820011094171, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MDR-1 ELEMENT 137-1400-05.