Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2590-051-001 ASSY 04-M found under Valve Assembly by Acorn Engineering Company. The National Stock Number assigned to this part is 4820015114473, 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 2590-051-001 ASSY 04-M.