A fencing coupler is a device used to connect two pieces of fencing together. Fencing couplers are made of metal and are used to join sections of chain link, vinyl, wood, and other types of fencing. They can be used to create a secure connection between two sections of fencing, or to attach a gate to a fence line. Fencing couplers are available in various sizes and come in a variety of materials, including aluminum, steel, and plastic.