Heat Shrink Tubing 15mm – 2:1 Ratio Waterproof Cable Sleeving for Automotive & DIY

This tubing has a 15mm (≈19/32\u201d) inner diameter before shrinking. It generally fits cable bundles or connectors up to about 14mm in diameter. After applying heat, it shrinks to approximately 7.5mm (≈5/16\u201d) at a 2:1 ratio. If you\u2019re unsure, measure your cable bundle\u2019s outer diameter and choose a size that\u2019s slightly larger before shrinking.

A 2:1 ratio means the tubing shrinks to half its original inner diameter when heat is applied. So this 15mm tubing will typically shrink down to approximately 7.5mm, creating a snug, secure fit around your cable or connector.

Yes. Once properly shrunk, this sleeving generally provides a moisture-resistant barrier suitable for automotive wiring, outdoor electrical repairs, and marine environments. For fully submersed applications, we recommend confirming suitability with our team.

Standard polyolefin heat shrink tubing typically activates at around 90–120°C (194–248°F). A heat gun is the recommended tool. Avoid open flames as they can scorch or unevenly shrink the material.

Yes. The 15mm diameter is well-suited for bundling or protecting multi-wire harnesses, connectors, and terminals commonly found in car, truck, and motorcycle wiring. The non-slip surface helps keep the sleeve in position during installation.

No. All color variants (Black, Red, Blue, Green, Yellow) share the same 2:1 shrink ratio and waterproof properties. Color coding is useful for identifying circuits or wire groups in complex wiring systems.

Each piece comes in a 1-metre (≈39.4\u201d) length. Use sharp scissors or a utility knife to cut to your desired length before sliding it over the cable. Cut slightly longer than needed to account for any end shrinkage.