Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HV20108 found under Cock Shutoff Screw Stem by Evans Tempcon Inc. The National Stock Number assigned to this part is 4820000048295, 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 HV20108.