Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8003-5SPCL found under Disk Valve by Treadwell Corporation. The National Stock Number assigned to this part is 4820009284235, 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 8003-5SPCL.