Ancor Adhesive Lined Heat Shrink Tubing (ALT) - 1/4" x 3" - 3-Pack - Red

Ancor Adhesive Lined Heat Shrink Tubing (ALT) in 1/4" x 3" Red—3-Pack is the marine-grade solution serious boaters and anglers reach for when protecting and insulating critical electrical connections on the water. Whether you're splicing battery leads, securing rigging connections, or waterproofing connector joints on your trolling motor or fish finder, this heat shrink tubing combines thermal contraction with built-in adhesive to create a sealed, durable barrier that withstands saltwater spray, vibration, and temperature extremes. Built to Coast Guard standards, Ancor tubing is trusted by professional marine electricians and recreational boaters alike who know that proper wire protection is the difference between a reliable system and costly corrosion failures at sea.

Each pack contains three pre-cut 3-inch sections of cross-linked polyolefin tubing engineered to shrink from 1/4" down to 5/64" (2mm) diameter when heated, conforming tightly around wires in the 16–10 AWG range. The adhesive lining melts as the tubing contracts, creating a waterproof seal that bonds directly to wire insulation and connectors—eliminating the need for additional sealant or tape. Cross-linked polyolefin is significantly stronger and more flexible than standard PVC, resisting UV degradation, fuel spills, battery acid, and the salt-laden environment of marine engines. This means connections remain insulated and protected even after years of exposure to harsh conditions.

Installation is straightforward: slide the tubing over your wire joint, apply heat with a heat gun or lighter, and the tubing shrinks and seals in seconds. The 3-pack format supplies enough material for multiple repairs or new builds on a single vessel, making it ideal for keeping in your toolbox alongside wire crimpers and electrical connectors. Perfect for splash-zone installations where exposed connections invite corrosion, Ancor ALT tubing is equally at home in fresh or saltwater environments, from bass boats and center consoles to pontoons and commercial fishing vessels. When you're far from shore and electrical reliability matters, Ancor tubing ensures your connections stay dry, secure, and functional.