This tubes are used as waterproof sealing in cable termination and joints. It is used for corrosion protection, environmental sealing and mechanical protection of pipes and pipe connections. It is also used for insulating underground & aerial connections in CATV plant, CCTV connections and in control cables splicing joints. https://www.galathermo.com/heat_shrink_end_caps/cable_end_sealing_caps/heat-shrink-co-extruded-tubing-premium-quality.html