Black Heat Shrinkable Tube is designed for insulation, stress control, weather resistance, and protection of cables, wires, and hoses. When heat is applied, the tube shrinks down to create a tight joint.
Do not overheat the tube as it may damage the material.
Use heat source like a cigarette lighter or heat gun for about 10 seconds to shrink the tube and create a tight joint.
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Simply slide a slightly larger tube at the desired location and apply heat through a cigarette lighter or a heat gun for about 10 seconds. The tube will shrink down and hold the joint tightly.