Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2289AY1A found under Adapter Waveguide by Southwest Machine And Manufacturing. The National Stock Number assigned to this part is 5985005484274, 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 2289AY1A.