Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B33647-1 found under Valve Check by Moog Inc. The National Stock Number assigned to this part is 4820013707801, 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 B33647-1.