Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1E3996000B2 found under Valve Plug by Proconex Inc. The National Stock Number assigned to this part is 4820016067811, 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 1E3996000B2.