Collection: Heavy Dual Wall 3M Adhesive-lined Heat Shrink Tubing 3:1

Heavy-duty 3:1 dual wall heat shrink tubing with 3M adhesive-lining delivers superior environmental sealing for automotive, marine, and industrial electrical systems. This high-performance tubing is designed for wire sizes from 18 AWG to 400 MCM, providing reliable insulation, strain relief, and waterproof sealing for cables, terminals, and splices. The outer polyolefin layer shrinks at a 3:1 ratio while the inner thermoplastic adhesive layer bonds tightly to wires and connectors to block out moisture, chemicals, and corrosion.

Available in black and red options, each size is precision-engineered with specifications such as recovered wall thickness up to 0.17" and inside diameters ranging from 0.1" to 2.0". Ideal for battery cables, ground wires, power leads, and heavy-gauge connections exposed to vibration or harsh conditions. Meets stringent performance demands for technicians, mechanics, and fleet maintenance operations.