Red Heat Shrink Tubing 3 to 1 Ratio 9.5mm 20ft Dual Wall With Adhesive Liner Marine Grade Waterproof Oil Proof Wear Resistant Tough as Nails Insulation For Wiring Harness Electrical Repair and Sealing

3:1 9.5mm heat shrink tubing with adhesive liner
✔️ 3:1 shrink, 9.5mm dia, 20 ft pack, 20 pcs x 1 ft, UL/CSA rated

This dual-wall heat shrink tubing combines a tough outer layer with an adhesive inner liner to form a waterproof, long-lasting seal around wires and connections. It’s a go-to solution for marine, automotive, and DIY electrical projects where rugged insulation and environmental sealing are needed.

✅ 3:1 shrink ratio for tight fits
✅ 9.5 mm pre-shrink diameter for common wiring
✅ Adhesive-lined dual-wall creates waterproof seal
✅ 20 ft total length (20 pcs x 1 ft) in each pack

💡 What is heat shrink tubing used for in electrical projects?

Handy for protecting wiring and sealing joints in tough environments.

• Protects insulation on wiring harnesses from moisture and abrasion.
• Adhesive lining helps seal connections against fuel, oil, and chemicals.
• Quick installs with a heat gun for fast, professional finishes.
• Choose correct diameter and shrink ratio for a snug, durable seal.