Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 411137-1 found under Stem Valve by Duhadaway Tool And Die Shop Inc. The National Stock Number assigned to this part is 4820008681916, 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 411137-1.