Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 990RPV-1.25-1.25 found under Valve Check by Halkey Roberts Corporation. The National Stock Number assigned to this part is 4820013117992, 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 990RPV-1.25-1.25.