Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AB9416-1D20A found under Valve Safety Relief by Columbia Products. The National Stock Number assigned to this part is 4820001409770, 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 AB9416-1D20A.