Integral ferrule

In a coupling adapted to be mounted and assembled on an end of a deformable pipe and to compress the outer surface of said pipe with respect to the inner surface of said pipe to provide a leak-proof seal, the combination prior to said assembly comprising:

• a ferrule ring having a portion outwardly of the outer surface of said pipe and having a seamless deformable ferrule arm integrally formed from said ring and extending longitudinally therefrom adjacent to the outer surface of said pipe, said arm having an outer surface with only a portion of said outer surface tapering toward the outer surface of the pipe said ring being placed over said pipe such that said ring surrounds an end portion thereof;
• a cam ring also located outwardly of the outer surface of said pipe and longitudinally placed from said deformable ferrule arm, and having a single inner curved surface, said surface being curved with respect to a longitudinally extending axis along said pipe and arranged to deform said ferrule arm in the area of said tapered outer surface into said pipe upon longitudinal movement of said cam ring against said ferrule;
• said curved surface having an axial extent substantially equal to the axial extent of said tapered outer surface and
• means for effecting such longitudinal movement, thereby deforming said ferrule and compression deforming said pipe and creating said leak-proof seal.