One of the mysteries of the English language finally explained.
1The action of installing the apparatus needed to supply gas to a building; the work or trade of a gas fitter.
2Chiefly in plural The pipes, brackets, and other apparatus needed to supply gas to a building.
Early 19th century; earliest use found in Freeman's Journal. From gas + fitting.
gas fitting/ˈɡas ˌfɪtɪŋ/
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