Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50M-160S found under Bellows Valve by Metrex Valve Corp. The National Stock Number assigned to this part is 4820012842285, 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 50M-160S.