Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S5901-31990580 found under Valve Expansion by Emerson Electric Co. The National Stock Number assigned to this part is 4820011844140, 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 S5901-31990580.