Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 40831A found under Shaft Lower Valve Cabin Pressure by P S Manufacturing Inc. The National Stock Number assigned to this part is 1660001620803, and the Federal Supply Class is 1660 Aircraft Air Conditioning Heating And Pressurizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 40831A.