What is an interference fit?
An interference fit is the result of the sockets (or hubs) of plastic fittings being tapered. The socket entrance is slightly larger than the pipe OD to allow for easy pipe insertion. The socket bottom is slightly smaller than the pipe OD to ensure that a tight (interference) fit occurs when pipe is inserted. This interference fit is an integral part of producing a strong bond between pipe and fitting during the solvent cementing process.
