Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 658947 found under Valve Check by Amfs American Fleet Services. The National Stock Number assigned to this part is 4820010661264, 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 658947.