Brass Compression Coupling Bright Chrome Plated CxC is used to connect two lengths of copper pipe with the same diameter. It requires no special tools or soldering to install, just tighten with a spanner. It creates a mechanical joint by compressing the ring onto the tube. It can be used in hot or cold water applications as well as heating and low pressure gas installations. The joint can be made on wet pipe work. The chrome plating provides a more aesthetically pleasing finish.