Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D4220D found under Antenna by Electrometrics. The National Stock Number assigned to this part is 5985010873093, 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 D4220D.