A grooved coupling connects two pipes using their specially prepared ends. Here's how it works: Pipe Preparation: A groove is formed or machined into the end of each pipe. Gasket Placement: A rubber gasket is placed so it wraps around and sits on top of the ends of the two pipes. Housing Installation: Two coupling housings (or segments) are positioned over the gasket. The edg... https://www.furdfittings.com/ductile-iron-grooved-pipe-fittings/