Abstract: A coupling including a tubular main body comprising means for fixing in a wall, and traversed by an axial channel terminating at one end in a conical flared portion. An annular nut screws onto said end of the body surrounding said flared portion. The bottom of the nut is pierced by an axial bore of diameter similar to that of said axial channel. The nut receives internally a sealing ring deformable by tightening, supported on said bottom of the nut to apply on said conical flared portion and to deform by tightening, an annular clip for anchoring said cable extending. The coupling is useful for the fluid-tight fastening of cables through a wall.