A heavy wall polyolefin tubing with a dual purpose meltable thermoplastic liner. High expansion ratios enable a minimum number of sizes to cover a broad range of cable and connector sizes. This tubing provides maximum protection for insulating and sealing electrical connections and terminations. Tubing can be used in most adverse conditions such as direct burial, urd and submersible installations. The tough outer jacket protects against abrasion, vibration and flexing. May be used over lead, steel, aluminum, copper, standard plastic and all elastomeric insulation's of power cables, battery cables and over all repair splices.