A Copuler (or coupling) is a device used in piping systems to connect two separate pipes, allowing for the continuous flow of fluids. It serves a crucial role in joining pipes of the same or different diameters and materials, maintaining structural integrity and preventing leaks. Pipe copulers come in various designs, including threaded, flanged, and welded versions, depending on the application and type of piping material used, such as steel, PVC, or copper.