Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 538 0190 00 2 found under Valve Plug by Hale Products Inc. The National Stock Number assigned to this part is 4820004275088, 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 538 0190 00 2.