Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 531-00-04 found under Valve Linear Directional Control by Ge Ionics Inc. The National Stock Number assigned to this part is 4810005670091, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 531-00-04.