Device for coupling the ends of carrier tubes used for guiding and protecting a cable. The device includes axially juxtaposed first and second tubular bodies, each having a first end for connection to one of the tube ends and a second end for connecting the body portions and which coaxially receives a flexible tubular sealing member. The bodies are connected such that they are relatively movable between a first position in which the body bodies are close together and the sealing member is in a rest state, and a second position in which the bodies are spaced apart and in which surfaces thereof contact the sealing member to dispose it into an energized state wherein it is urged radially inward and has an inner diameter that is no greater than the outside diameter of the cable.