Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 08R1664D0X found under Valve Check by Crane Company. The National Stock Number assigned to this part is 4820016607831, 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 08R1664D0X.