Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 409 50003 17 found under Seal Waveguide by The Boeing Company. The National Stock Number assigned to this part is 5985013741200, and the Federal Supply Class is 5985 Antennas Waveguides And Related Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 409 50003 17.