Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18317A1 found under Valve by Myers F E Co. The National Stock Number assigned to this part is 4820012792554, 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 18317A1.