Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11E421440 found under Disk Valve by Stewart And Stevenson Power Products. The National Stock Number assigned to this part is 4820016026121, 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 11E421440.