Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D5494-000 found under Seat Valve by Kieley And Mueller Inc. The National Stock Number assigned to this part is 4820004412348, 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 D5494-000.