A grooved fitting, often known as a grooved coupling, has 4 components: grooved pipe, gasket, coupling housing, and nuts and bolts. The groove is produced by chilly-forming (or machining) a groove at the end of a pipe. A gasket encompassed by coupling housing is wrapped round the two pipe finishes, http://keeganmfntz.jaiblogs.com/14121881/details-fiction-and-pipe-fitting