An assembly may include a fitting, a first pipe, and a first seal. The fitting may include an annular body having a first insertion end and an inner diametrical surface having a first knurled portion disposed adjacent the first insertion end. The first pipe may include a first end portion that is received into the first insertion end of the body and an outer diametrical surface including knurls formed thereon. The knurls of the outer diametrical surface may engage the first knurled portion of the fitting. The first seal element may be disposed within the fitting and may sealingly engage the first pipe and the fitting body. The engagement between the inner diametrical surface of the fitting and the outer diametrical surface of the pipe may a press fit and/or an interference fit.