A grooved fitting, often known as a grooved coupling, has four things: 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 across the two pipe finishes, http://troyhqqmd.dsiblogger.com/17810421/a-secret-weapon-for-valves-and-fittings