Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P8040A found under Seat Valve by Atlas Valve Co. The National Stock Number assigned to this part is 4820013148767, 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 P8040A.