4:1 Heat Shrink Tubing with Adhesive Glue Lined — Waterproof Wire Sleeve

Measure the outer diameter of your cable or connector before shrinking. Choose a tubing size whose recovered (shrunken) inner diameter is slightly smaller than your cable OD for a snug seal. For example, 6mm tubing typically recovers to around 1.5mm, so it suits cables up to about 5mm OD. When in doubt, size up — you can always apply more heat gradually. If you need help selecting, contact us with your cable OD and we'll recommend the right size.

A 4:1 shrink ratio means the tubing shrinks to one-quarter of its original supplied diameter when heat is applied. This makes it suitable for covering connectors, splices, or irregular shapes that standard 2:1 tubing cannot conform to tightly. For example, a 20mm tube will generally recover to approximately 5mm — though exact recovered dimensions may vary slightly by batch.

The dual-wall construction — a polyolefin outer layer plus a hot-melt adhesive inner lining — generally provides a firm mechanical bond once cooled. The adhesive flows into gaps and hardens, creating a strain-relief effect that resists pull-out and vibration in most DIY and light-industrial applications. For high-vibration environments such as engine bays, ensure the tubing is fully shrunk and the adhesive has fully set before flexing the cable.

Yes. The adhesive inner lining melts and flows to fill voids, creating a moisture-resistant seal around the cable. It is generally suitable for outdoor wiring, marine connections, and automotive harnesses where moisture ingress is a concern. For fully submerged or high-pressure water exposure, contact us to confirm suitability for your specific application.

This tubing is not thread-specific — it is designed to sleeve over cables, wires, and connectors of various standards. It is compatible with common connector types including Anderson connectors, ring terminals, butt splices, and multi-pin housings, provided the connector OD falls within the tubing's supplied inner diameter range. It works with both metric and imperial cable sizes.

Dual-wall adhesive-lined tubing typically requires a higher activation temperature than standard tubing — generally around 120–135°C (248–275°F) to fully activate the adhesive. A heat gun is strongly recommended for even heat distribution. An open flame can be used with caution but may scorch the outer jacket before the adhesive fully flows. Keep the heat source moving to avoid hot spots.

Yes, adhesive-lined heat shrink tubing is widely used in automotive and marine wiring repairs. The waterproof seal helps protect connections from road salt, fuel vapors, and bilge moisture. Ensure the wire gauge and connector OD fall within the selected tubing size's recovery range before installation. It is also commonly used for solar panel wiring, RV electrical systems, and trailer harness repairs.