Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DM189H-257 found under Switch Radio Frequency Transmission Line by General Microwave Corporation. The National Stock Number assigned to this part is 5985012289163, 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 DM189H-257.