Terminators, also known as loads or dummy loads, are used to dissipate RF energy without radiating electromagnetically. They are used to cap-off unused ports on couplers and dividers, maintaining the device’s impedance and VSWR specification.
The load value, in this case 5 Watts, defines the maximum amount of energy capable of being dissipated. RF energy is dissipated through thermal radiation, i.e., heat, and consequently large loads require heat-sink features.
This N Male load is suitable for terminating couplers and dividers that have an N Female port interface.