Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 411137-1 found under Stem Valve by B E C Systems 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.