Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P31-424 found under Valve Gauge Reader by Circor Aerospace Inc. The National Stock Number assigned to this part is 4820004710102, 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 P31-424.