Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 80661-00 PART 80661-00 1IN found under Valve Stop Check by Milwaukee Valve Company Inc. The National Stock Number assigned to this part is 4820007529526, 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 80661-00 PART 80661-00 1IN.