Black Heat Shrink Tube Electrical Tubing Wrap Sleeving Car Cable 2:1 Heatshrink

Marking and Identification: in Addition to the Uses Described Above, Heat Shrink Tubing Can Also Be Used to Identify and Differentiate Between Various Lines or Pipelines. Tightly Wrapping the Heat Shrink Tubing Around the Joint Improves the Friction and Clamping Ability of the Joint, Thus Enabling the Combination of the Two Parts.

eBay