Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P39-433M PIECE 47 found under Valve Safety Relief by Circor Aerospace Inc. The National Stock Number assigned to this part is 4820010123373, 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 P39-433M PIECE 47.