{"product_id":"3-1-red-adhesive-heat-shrink-tubing-glue-lined-waterproof","title":"3:1 Red Adhesive Heat Shrink Tubing – Glue Lined Waterproof Sleeving","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3:1 Red Adhesive Heat Shrink Tubing — Waterproof Glue Lined Sleeving for Wiring Protection\u003c\/h2\u003e\n\u003cp\u003eExposed wire splices, corroded connectors, and unprotected terminals are among the most common causes of electrical failures in automotive, marine, and outdoor installations. Whether you're a professional electrician, a weekend DIYer, or a boat owner chasing down a wiring gremlin, you need a sleeving solution that seals completely — not just covers.\u003c\/p\u003e\n\u003cp\u003eThis 3:1 red adhesive heat shrink tubing features a dual-wall construction: an outer polyolefin sleeve that shrinks to one-third its original diameter, and an inner hot-melt adhesive lining that flows into gaps as it heats, forming a watertight mechanical bond. Available in diameters from φ1.6mm (≈1\/16\") to φ39mm (≈1-1\/2\"), and in lengths of 1m, 3m, 5m, 10m, and 20m per piece, it covers everything from fine instrument wiring to large cable bundles.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include automotive wiring harness repairs and splice protection, marine electrical connections exposed to salt spray, outdoor landscape lighting and irrigation control wiring, and trailer connector sealing — all applications where a standard 2:1 non-adhesive sleeve simply isn't 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:\u003c\/strong\u003e Works with standard copper and aluminum conductors, PVC and polyethylene insulated wire, automotive-grade harness connectors, and most crimp terminals. Shrink temperature typically 120°C (248°F) — compatible with standard heat guns.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 3:1 Adhesive 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\u003eWaterproof Adhesive Lining\u003c\/strong\u003e — The inner hot-melt glue layer melts and flows during shrinking, sealing around wires and connectors to block moisture, corrosion, and contaminants — ideal for marine and outdoor wiring protection.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔴\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHigh-Visibility Red Color\u003c\/strong\u003e — The red finish makes it easy to identify positive leads, phase markers, or specific circuit groups in complex wiring harnesses, reducing troubleshooting time.\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 one-third its supplied diameter, providing far greater coverage flexibility than standard 2:1 tubing — suitable for irregular connectors, flanged terminals, and bundled cable runs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Fourteen diameter options from φ1.6mm to φ39mm (≈1\/16\" to ≈1-1\/2\") cover fine instrument wiring through large power cable bundles in a single product line.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✂️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCut-to-Length Flexibility\u003c\/strong\u003e — Available in 1m, 3m, 5m, 10m, and 20m lengths so you can buy exactly what your project needs — no waste from oversized rolls, no running short on a long harness run.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔥\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHeat Gun Compatible\u003c\/strong\u003e — Activates reliably with any standard heat gun; no open flame required. The controlled shrink process ensures even adhesive distribution and a clean, professional finish on automotive wiring repairs and DIY electrical projects.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 3:1 Glue 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\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eDual-wall adhesive-lined heat shrink tubing\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\u003eColor\u003c\/th\u003e\n\u003ctd\u003eRed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters (Supplied)\u003c\/th\u003e\n\u003ctd\u003eφ1.6mm (≈1\/16\") · φ2.4mm (≈3\/32\") · φ3.2mm (≈1\/8\") · φ4mm (≈5\/32\") · φ4.8mm (≈3\/16\") · φ6.4mm (≈1\/4\") · φ7.9mm (≈5\/16\") · φ9.5mm (≈3\/8\") · φ12.7mm (1\/2\") · φ15.4mm (≈5\/8\") · φ19.1mm (3\/4\") · φ25.4mm (1\") · φ30mm (≈1-3\/16\") · φ39mm (≈1-1\/2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1m · 3m · 5m · 10m · 20m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Wall Material\u003c\/th\u003e\n\u003ctd\u003ePolyolefin (cross-linked)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Adhesive Material\u003c\/th\u003e\n\u003ctd\u003eHot-melt polyamide adhesive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 120°C (248°F)\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\u003eOperating Temperature Range\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\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\u003eFlame Retardancy\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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\u003eSold As\u003c\/th\u003e\n\u003ctd\u003eIndividual piece (per meter length selected)\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\u003eNote:\u003c\/strong\u003e Recovered (post-shrink) inner diameter varies by supplied size. If you need exact recovered dimensions for a tight-tolerance application, please contact us to confirm before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right diameter for my wire or connector?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outer diameter of the wire, bundle, or connector you need to cover. Choose a tubing size whose recovered (post-shrink) inner diameter is slightly smaller than your component — this ensures a tight, waterproof seal. For example, φ4mm tubing recovers to approximately 1.3mm, so it works well on wires up to about 1.2mm OD. When in doubt, size up one step and test on a scrap piece first.\u003c\/p\u003e\n\u003cp\u003eQuick inch reference: φ3.2mm ≈ 1\/8\" · φ6.4mm ≈ 1\/4\" · φ9.5mm ≈ 3\/8\" · φ12.7mm = 1\/2\" · φ19.1mm = 3\/4\" · φ25.4mm = 1\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat shrink ratio does this tubing use, and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis tubing has a 3:1 shrink ratio, meaning it shrinks to one-third of its original diameter when heat is applied. A 3:1 ratio provides significantly more coverage flexibility than standard 2:1 tubing, making it suitable for irregular shapes, connectors with flanges, or bundled cables of varying thickness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this tubing waterproof, and can it be used outdoors or in marine environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The inner adhesive lining melts during shrinking and flows into gaps, creating a moisture-resistant seal around the substrate. This makes it generally suitable for outdoor wiring, marine electrical connections, and other environments where moisture ingress is a concern. For fully submerged or high-pressure water exposure, verify suitability with your 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\u003eThis tubing typically activates at around 70–90°C (158–194°F) and fully shrinks at approximately 120°C (248°F). A heat gun is the recommended tool for even, controlled shrinking. An open flame (lighter or torch) can be used carefully on larger diameters, but risks scorching the tubing or uneven shrinkage. Avoid direct contact with the heat source.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the adhesive lining made of, and is it compatible with my wiring insulation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe inner lining is generally a hot-melt polyamide adhesive that bonds to most common wire insulation materials including PVC, polyethylene, and nylon jacketing. It is typically compatible with standard automotive, marine, and household wiring. If you are working with specialty insulation materials, contact us to confirm compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing for automotive wiring repairs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, 3:1 glue-lined heat shrink tubing is widely used in automotive wiring harness repairs, splice protection, and connector sealing. The adhesive lining provides vibration resistance and moisture protection that standard non-adhesive tubing cannot match. It is suitable for engine bay wiring, trailer connectors, and underbody harness repairs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I convert the diameter sizes from mm to inches?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eHere are the approximate inch equivalents for all available diameters:\u003c\/p\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003eφ1.6mm ≈ 1\/16\"\u003c\/li\u003e\n\u003cli\u003eφ2.4mm ≈ 3\/32\"\u003c\/li\u003e\n\u003cli\u003eφ3.2mm ≈ 1\/8\"\u003c\/li\u003e\n\u003cli\u003eφ4mm ≈ 5\/32\"\u003c\/li\u003e\n\u003cli\u003eφ4.8mm ≈ 3\/16\"\u003c\/li\u003e\n\u003cli\u003eφ6.4mm ≈ 1\/4\"\u003c\/li\u003e\n\u003cli\u003eφ7.9mm ≈ 5\/16\"\u003c\/li\u003e\n\u003cli\u003eφ9.5mm ≈ 3\/8\"\u003c\/li\u003e\n\u003cli\u003eφ12.7mm = 1\/2\"\u003c\/li\u003e\n\u003cli\u003eφ15.4mm ≈ 5\/8\"\u003c\/li\u003e\n\u003cli\u003eφ19.1mm = 3\/4\"\u003c\/li\u003e\n\u003cli\u003eφ25.4mm = 1\"\u003c\/li\u003e\n\u003cli\u003eφ30mm ≈ 1-3\/16\"\u003c\/li\u003e\n\u003cli\u003eφ39mm ≈ 1-1\/2\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003ediameter and length\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"φ1.6mm \/ 1m","offer_id":52330164453650,"sku":"GLFBLFFGLBZSJ000361x1","price":2.45,"currency_code":"USD","in_stock":true},{"title":"φ2.4mm \/ 1m","offer_id":52330164486418,"sku":"GLFBLFFGLBZSJ000369x1","price":2.45,"currency_code":"USD","in_stock":true},{"title":"φ3.2mm \/ 1m","offer_id":52330164519186,"sku":"GLFBLFFGLBZSJ000376x1","price":2.28,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ 1m","offer_id":52330164551954,"sku":"GLFBLFFGLBZSJ000383x1","price":2.45,"currency_code":"USD","in_stock":true},{"title":"φ4.8mm \/ 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3m","offer_id":52330165043474,"sku":"GLFBLFFGLBZSJ000390x3","price":3.75,"currency_code":"USD","in_stock":true},{"title":"φ6.4mm \/ 3m","offer_id":52330165076242,"sku":"GLFBLFFGLBZSJ000397x3","price":4.75,"currency_code":"USD","in_stock":true},{"title":"φ7.9mm \/ 3m","offer_id":52330165109010,"sku":"GLFBLFFGLBZSJ000404x3","price":5.58,"currency_code":"USD","in_stock":true},{"title":"φ9.5mm \/ 3m","offer_id":52330165141778,"sku":"GLFBLFFGLBZSJ000411x3","price":8.3,"currency_code":"USD","in_stock":true},{"title":"φ12.7mm \/ 3m","offer_id":52330165174546,"sku":"GLFBLFFGLBZSJ000418x3","price":10.0,"currency_code":"USD","in_stock":true},{"title":"φ15.4mm \/ 3m","offer_id":52330165207314,"sku":"GLFBLFFGLBZSJ000425x3","price":12.39,"currency_code":"USD","in_stock":true},{"title":"φ19.1mm \/ 3m","offer_id":52330165240082,"sku":"GLFBLFFGLBZSJ000432x3","price":14.27,"currency_code":"USD","in_stock":true},{"title":"φ1.6mm \/ 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5m","offer_id":52330165502226,"sku":"GLFBLFFGLBZSJ000411x5","price":13.29,"currency_code":"USD","in_stock":true},{"title":"φ12.7mm \/ 5m","offer_id":52330165534994,"sku":"GLFBLFFGLBZSJ000418x5","price":16.01,"currency_code":"USD","in_stock":true},{"title":"φ1.6mm \/ 10m","offer_id":52330165567762,"sku":"GLFBLFFGLBZSJ000361x10","price":8.2,"currency_code":"USD","in_stock":true},{"title":"φ2.4mm \/ 10m","offer_id":52330165600530,"sku":"GLFBLFFGLBZSJ000369x10","price":8.02,"currency_code":"USD","in_stock":true},{"title":"φ3.2mm \/ 10m","offer_id":52330165633298,"sku":"GLFBLFFGLBZSJ000376x10","price":7.7,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ 10m","offer_id":52330165666066,"sku":"GLFBLFFGLBZSJ000383x10","price":9.29,"currency_code":"USD","in_stock":true},{"title":"φ4.8mm \/ 10m","offer_id":52330165698834,"sku":"GLFBLFFGLBZSJ000390x10","price":10.65,"currency_code":"USD","in_stock":true},{"title":"φ6.4mm \/ 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