Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 644068-004 found under Dummy Load Electrical by Watkins Johnson Co. The National Stock Number assigned to this part is 5985004703721, 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 644068-004.