Before revision: A Coupling (aka coupler) ( 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 jointed , welded (steel), brazed or soldered (copper, brass etc.)
After revision: 250px|Pipe coupling (copper sweat) coupler) ( 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 joinedA coupling (orused in , welded (steel), brazed or soldered (copper, brass etc.)