Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TA320 found under Cock Shutoff Screw Stem by Arizona Gear And Mfg Co. The National Stock Number assigned to this part is 4820010031056, 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 TA320.