Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BLT 308-01 DET.04 found under Stem Needle Valve by Wa Kates Company The. The National Stock Number assigned to this part is 4820016230877, 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 BLT 308-01 DET.04.