Specialty Microwave KU-Band Crossguide Coupler is a basic KU-Band Crossguide Coupler with a frequency range of 14-14.5 GHz
A point worth mentioning are the white directional arrows on the coupler. If these arrows were not marked it would be possible to place either end toward the amplifier. That would be a mistake because these couplers are tuned to only work in one direction.
The arrows point to the source of the RF signal (the amplifier) and to the monitor port for a connection to a power meter or spectrum analyzer.