4 150 316 Half CouplingThe 4 150 316 Half Coupling is a small diameter pipe fitting used to connect a pipe to another component, such as a valve, flange, or equipment. Unlike a full coupling, which has threading or welding connections on both ends, a half coupling has only one threaded or welded end, while the other end is typically left open for welding directly to a pipeline. This makes it ideal for branch connections in piping systems. The class 150 pressure rating ideal