Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 690 00001 found under Valve Assy Compress by Sheffer Corp. The National Stock Number assigned to this part is 4820001344373, 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 690 00001.