Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M8020-4 found under Stem Fluid Valve by Henry Technologies Inc. The National Stock Number assigned to this part is 4820005863877, 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 M8020-4.