{"product_id":"heat-shrink-tubing-3-1-adhesive-lined-12-7mm-dual-wall","title":"Heat Shrink Tubing 3:1 Adhesive Lined — Φ12.7mm Dual-Wall Cable Sleeve","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHeat Shrink Tubing 3:1 Adhesive Lined — Reliable Dual-Wall Protection for Every Wire Connection\u003c\/h2\u003e\n\u003cp\u003eWhether you are repairing a frayed automotive harness, sealing a marine splice against salt air, or tidying up a panel build, a loose or unprotected connection is always one vibration away from failure. DIYers, electricians, and fabricators who work with exposed wiring need a sleeve that does more than just cover — it needs to seal, grip, and hold. This dual-wall adhesive-lined heat shrink tubing is built for exactly that.\u003c\/p\u003e\n\u003cp\u003eEach order is a continuous roll of dual-wall heat shrink tubing with a supplied inner diameter of \u003cstrong\u003eΦ12.7mm (1\/2\")\u003c\/strong\u003e and a 3:1 shrink ratio, recovering to approximately 4mm (5\/32\") after heat is applied. The outer wall is a flexible polyolefin sleeve; the inner wall is a hot-melt adhesive lining that flows and bonds to the cable surface during shrinking, creating a moisture-resistant, strain-relieving seal. Available in lengths from \u003cstrong\u003e1M (≈3.3 ft)\u003c\/strong\u003e to \u003cstrong\u003e40M (≈131 ft)\u003c\/strong\u003e, and in seven colors: Black, White, Red, Green, Yellow, Blue, and Transparent.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include sealing battery terminal connections on boats and RVs, protecting wire splices in automotive underhood environments, bundling and color-coding control panel wiring, and providing strain relief on connector backshells — all scenarios where a standard 2:1 non-adhesive sleeve simply is not enough.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003eℹ️\u003c\/span\u003e \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e Supplied ID is Φ12.7mm (1\/2\"). Fits cables and connectors with an OD of approximately 4mm–12mm. Confirm your cable or connector outer diameter before ordering. For smaller diameters, see our other heat shrink tubing sizes.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 3:1 Adhesive-Lined Heat Shrink Tubes\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDual-Wall Adhesive Seal\u003c\/strong\u003e — The inner hot-melt adhesive layer flows during shrinking to bond tightly around cables, creating a moisture-resistant seal that standard single-wall tubing cannot provide.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e3:1 Shrink Ratio\u003c\/strong\u003e — Shrinks to approximately one-third of its original diameter, giving you flexibility to cover a wider range of cable ODs with a single size — ideal for stepped connectors and irregular shapes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e7 Color Options\u003c\/strong\u003e — Black, White, Red, Green, Yellow, Blue, and Transparent allow color-coded wiring identification and clean, professional-looking installations.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e8 Length Options (1M–40M)\u003c\/strong\u003e — From single-job cuts to full production rolls, choose the exact quantity you need for automotive wiring harness repair, marine electrical work, or panel builds.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌊\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMoisture and Corrosion Resistance\u003c\/strong\u003e — The adhesive-lined construction is designed for outdoor, marine, and underhood environments where water ingress and corrosion at connection points are ongoing concerns.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Polyolefin Outer Wall\u003c\/strong\u003e — Remains pliable after shrinking, so it moves with the cable rather than cracking under vibration — a key advantage in automotive and off-road vehicle wiring applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Dual-Wall Adhesive-Lined Heat Shrink Tubing\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied Inner Diameter\u003c\/th\u003e\n\u003ctd\u003eΦ12.7mm (1\/2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e3:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecovered Inner Diameter\u003c\/th\u003e\n\u003ctd\u003eTypically ≈4mm (5\/32\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWall Construction\u003c\/th\u003e\n\u003ctd\u003eDual-wall (polyolefin outer + hot-melt adhesive inner)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Colors\u003c\/th\u003e\n\u003ctd\u003eBlack, White, Red, Green, Yellow, Blue, Transparent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1M, 2M, 5M, 8M, 10M, 20M, 30M, 40M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 70–90°C (158–194°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFull Shrink \/ Adhesive Flow Temp\u003c\/th\u003e\n\u003ctd\u003eTypically 120–135°C (248–275°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Tool\u003c\/th\u003e\n\u003ctd\u003eHeat gun\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eAutomotive, marine, RV, electrical panel wiring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage Rating\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature Range\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSpec Note:\u003c\/strong\u003e Recovered diameter and temperature ratings are typical values for adhesive-lined 3:1 polyolefin tubing of this size. If your application has specific voltage or temperature requirements, please contact us to confirm before ordering.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat diameter wire or cable fits inside this Φ12.7mm heat shrink tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis tubing has a supplied inner diameter of approximately 12.7mm (1\/2\"). After shrinking at a 3:1 ratio, the recovered inner diameter is typically around 4mm (5\/32\"). It generally fits cable bundles or connectors in the range of 4mm–12mm before shrinking. Always measure your cable or connector OD and confirm it falls within that range before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the 3:1 shrink ratio mean, and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA 3:1 ratio means the tubing shrinks to roughly one-third of its original diameter when heat is applied. Compared to standard 2:1 tubing, this gives you more coverage flexibility — you can use a single size across a wider range of cable diameters. It is especially useful for stepped connectors, terminals, and irregular shapes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this heat shrink tubing waterproof and suitable for outdoor use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The dual-wall construction includes an inner adhesive layer that melts and flows during shrinking, creating a moisture-resistant seal around the cable. This makes it generally suitable for outdoor wiring, marine environments, and underground splices where moisture ingress is a concern. For fully submersed or high-pressure water exposure, verify the specific application requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat temperature is needed to shrink this tubing, and what tools can I use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAdhesive-lined dual-wall tubing typically activates at around 70–90°C (158–194°F) and fully shrinks and flows adhesive at approximately 120–135°C (248–275°F). A heat gun is the recommended tool. An open flame (lighter or torch) can be used carefully in the field, but may cause uneven shrinking or scorching. Do not use a standard hair dryer — it generally does not reach sufficient temperature.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat colors are available, and does color affect performance?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis tubing is available in Black, White, Red, Green, Yellow, Blue, and Transparent. Color is purely aesthetic and does not affect electrical or mechanical performance. Transparent is useful when you need to see the underlying wire markings or connector after installation. Black is the most common choice for general electrical work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAvailable lengths range from 1M (≈3.3 ft) to 40M (≈131 ft). For small repairs or a handful of splices, 1M–2M is typically sufficient. For automotive wiring harnesses or panel builds, 5M–10M is a common choice. For production runs or large installations, 20M–40M rolls offer better value per meter. Measure your total run length and add at least 10–15% for waste and overlap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this tubing compatible with automotive, marine, and RV wiring?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Adhesive-lined 3:1 heat shrink tubing is widely used in automotive, marine, RV, and off-road vehicle wiring because the inner adhesive creates a strain-relief bond and moisture seal at connectors and splices. It is generally compatible with standard copper wire, tinned copper, and most connector types used in 12V and 24V DC systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your color and length above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Black \/ 1M","offer_id":52329953296658,"sku":"GLFBFHHGLBZSJ000416x1","price":5.52,"currency_code":"USD","in_stock":true},{"title":"Black \/ 2M","offer_id":52329953329426,"sku":"GLFBFHHGLBZSJ000416x2","price":9.93,"currency_code":"USD","in_stock":true},{"title":"Black \/ 5M","offer_id":52329953362194,"sku":"GLFBFHHGLBZSJ000416x5","price":23.16,"currency_code":"USD","in_stock":true},{"title":"Black \/ 8M","offer_id":52329953394962,"sku":"GLFBFHHGLBZSJ000416x8","price":36.39,"currency_code":"USD","in_stock":true},{"title":"Black \/ 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