Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number IF40288 0560000 found under Disk Valve Metallic by William Powell Company The. The National Stock Number assigned to this part is 4820010904210, 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 IF40288 0560000.