Dual-Wall Heat Shrink Sleeve 4:1 — Adhesive-Lined Waterproof Black Insulating Tube

4:1 shrink ratio dual-wall heat shrink tubing engineered for reliable insulation and protection. These black, heat-shrinkable tube sleeves feature an adhesive (glue) inner lining that melts and seals gaps when heated, producing a waterproof, secure bond around splices and terminations. The robust, thick outer wall provides mechanical strength and abrasion resistance while the inner adhesive ensures excellent sealing and long-lasting insulation. Ideal for protecting electrical connections where a durable, moisture-resistant seal is required.