The coupling factor represents the primary property of a directional coupler. The insertion loss of an ideal directional coupler will consist entirely of the coupling loss. The Moreno coupler is good for tight coupling applications. When the coupling is designed to be it is called a hybrid coupler. This configuration consists of a vehicle coupler (vehicle connector and vehicle inlet). This system used fibre optic direction coupler. The "optical coupler" combined with the optical receiver forms a node. Type N connectors, and all IEC 60320 "appliance coupler" plugs are examples of this. A new Allis chalmers designed Snap- Coupler hitch was used. The C1 coupler and C2 inlet were commonly used for mains-powered electric shavers. The trailer coupler attaches to the trailer ball. Another advantage is the extrusion of pipes with integrated coupler including rubber seal. Guidance is achieved by means of a grating coupler. It is rectangular and has pins parallel to the long axis of the coupler face. This formed a star-type network centered on the signal coupler.