A grooved fitting, often known as a grooved coupling, has 4 components: grooved pipe, gasket, coupling housing, and nuts and bolts. The groove is made by chilly-forming (or machining) a groove at the conclusion of a pipe. A gasket encompassed by coupling housing is wrapped round the two pipe ends, http://valvesandfittings15693.blogzet.com/how-pipe-fitting-can-save-you-time-stress-and-money-9096478