Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 69-3456 found under Valve Restrictor Check by Downey Manufacturing Inc. The National Stock Number assigned to this part is 4820006013235, 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 69-3456.