Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 400-0004 found under Valve Lock by Summer Equipment Ltd. The National Stock Number assigned to this part is 4820013410914, 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 400-0004.