Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B850-Z-129-BM-A found under Body Valve by Emerson Electric Co. The National Stock Number assigned to this part is 4820012156575, 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 B850-Z-129-BM-A.