Before revision: 250px|Pipe coupling (copper sweat) A coupling (or coupler) (used in piping or plumbing) is a very short-length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (steel), brazed or soldered (copper, brass etc.)
After revision: 250px|Pipe coupling (copper sweat) A coupling (or coupler) (used in piping or plumbing) is a very short length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (steel), brazed or soldered (copper, brass etc.)