pipefitting

The English word “pipefitting” has 2 meanings listed here.

noun

The work of a pipefitter.
A piece, such as a coupling, elbow, or valve, used for connecting lengths of pipe or as accessory to a pipe.

From pipe + fitting.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.