Abstract: The individual tubes are separated from each other at the end of a cable composed of a tube bundle, by means of a cap member having a neck in heat shrink fit on the cable jacket and having an end plate with sleeves through which pass groups of tubes, a plurality of further members have their respective necks heat shrunken onto the sleeves, and individual sleeves on the further members single out and separate the individual tubes of the cable, the latter sleeves being also mounted on the tubes in heat shrink fit. Further features relate to thermal insulation form stability, and pressure proofing of the construction, all destined to seal off the interior of the cable while permitting feed through of the individual tubes for physical fan-out or fan-in.