Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number J3320 70020 found under Valve Check by Altra Holdings Inc. The National Stock Number assigned to this part is 4820012450180, 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 J3320 70020.