A grooved fitting, often called a grooved coupling, has 4 components: grooved pipe, gasket, coupling housing, and nuts and bolts. The groove is created by cold-forming (or machining) a groove at the conclusion of a pipe. A gasket encompassed by coupling housing is wrapped within the two pipe finishes, with http://valvesandfittings10740.pointblog.net/Indicators-on-valves-ad-fittings-You-Should-Know-26991309