What type of fitting includes a grip ring, gasket, middle ring, and bolt and nut?

The type of fitting that includes a grip ring, gasket, middle ring, and bolt and nut is a bolted coupling. This design is specifically engineered to create a secure and leak-proof connection between two segments of pipe. The grip ring helps to hold the pipe securely in place, while the gasket provides a seal to prevent any fluid leakage. The middle ring aids in the alignment and stabilization of the connection, and the bolt and nut assembly allows for a tight and adjustable fit, ensuring that the connection can withstand pressure and vibrations that may occur in a distribution system. The structured components of this fitting contribute to its effectiveness in maintaining the integrity of the plumbing infrastructure.