A cable seal for feed-throughs on housings is provided. Cables or hoses are fed through the feed-through into the housing and are sealed by two sealing rings. Because of different diameters of the sealing rings, the sealing rings are radially expanded or compressed by an axial force and the cable is sealed to the housing tightly with respect to the surroundings. The axial force on the sealing rings is produced by a pressing element that can be screwed on.