Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 103609-1 found under Valve Check by Metadure Parts And Sales Inc. The National Stock Number assigned to this part is 4820008863816, 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 103609-1.