Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7643694-505 found under Regulator Assembly by Boeing Company The. The National Stock Number assigned to this part is 1660001229327, 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 7643694-505.