Coupling (piping)

Short description: Short length of pipe which allows two other pipes to be joined

Pipe coupling (copper sweat)

In piping and plumbing, a coupling (or coupler) 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.) together.

Alternatively, it is a short length of pipe with two female National pipe threads (NPT) (in North American terms, a coupler is a double female while a nipple is a double male) or two male or female British standard pipe threads.

If the two ends of a coupling are of different standards or joining methods, the coupling is called an adapter.[1] Examples of adapters include one end BSP threaded with the other NPT threaded, and one end threaded with the other a plain socket for brazing.

A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling.[2]

## Contents

* 1 See also
* 2 References
* 3 Further reading
* 4 External resources

## See also

* Closet flange
* Eccentric reducer
* Nipple (plumbing)
* Piping and plumbing fittings
* Reducer
* Street elbow

## References

1. ↑ "Fitting | Definition of Fitting by Merriam-Webster". 2016-01-29. https://brisbaneplumbinganddrainage.com.au/.
2. ↑ "acquisition Hage Haustechnik in Germany" (in en). https://aalberts.com/progress/aalberts-industries-strengthens-stainless-steel-fittings-activities.

## Further reading

* ASME B1.20.7 Hose Coupling Screw Threads, Inch. (Quote: The normal sequence of connections, in relation to the direction of flow, is from an externally threaded nipple into an internally threaded coupling)

## External resources

* PDF illustrating assorted adapters

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