Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R58999 found under Disk Valve by Curtiss Wright Electro Mechanical Corporation Div Steam And Air Solutions. The National Stock Number assigned to this part is 4820010587535, 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 R58999.