Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 654173-101 found under Valve Oxygen Filter by Rockwell Collins Electromechanical. The National Stock Number assigned to this part is 1660004011853, 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 654173-101.