Abstract: A device is useful for extrusion-coating a tube, or the connection zone of a tubular composite body, which zone has to be sealed, with rubber or plastic. The device is particularly useful for extrusion-coating a hose connection, which includes a connection pipe made of rubber or plastic, onto which the rubber or plastic hose section is pushed. It is essential that the device, in addition to the fixed molding tool contour with injection nozzles, has at least one, in particular at least two slide clamps per circumferential unit. This enables the sealing surface of the slide clamp substantially to have the contour of the surface of the article directly opposing it in the sealing zone.