Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31-47-0307 found under Valve Trip by W F E L Ltd. The National Stock Number assigned to this part is 4820011825034, 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 31-47-0307.