Pipe coupling (Pipe socket) is a kind of pipe fitting to joint two pipes or fittings, and the body is like a short pipe with a socket on one end or both ends. The connection methods could be Thread. Commonly the coupling has two ends of female thread, it is the Full coupling. If one end of a coupling is plain end, it is a Half coupling.
The two ends of a coupling can be different type, for example, one end is plain end, another end is NPT thread. Alternatively, the coupling also can be one end BSP thread but another end is NPT thread . then it is a adapter to connect two different end pipes.
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