{"product_id":"3-1-yellow-adhesive-heat-shrink-tubing-glue-lined-waterproof-sleeving","title":"3:1 Yellow 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 Yellow Adhesive Heat Shrink Tubing — Waterproof Glue Lined Wire Sleeving\u003c\/h2\u003e\n\u003cp\u003eExposed wire splices and bare connectors are a liability in any environment where moisture, vibration, or abrasion are present. Whether you are wiring a boat, routing cables under a vehicle hood, or protecting outdoor electrical connections, standard electrical tape simply does not hold up. This 3:1 yellow adhesive heat shrink tubing is built for DIYers, electricians, and automotive technicians who need a durable, waterproof seal they can trust.\u003c\/p\u003e\n\u003cp\u003eEach piece is made from a dual-wall polyolefin construction: a tough outer jacket that shrinks to one-third its original diameter, and an inner layer of thermoplastic adhesive (hot-melt glue) that flows and bonds to the wire or connector surface during heating. Available in diameters from φ1.6mm (≈1\/16\") to φ39mm (≈1-1\/2\"), and in lengths of 1m (≈3.3 ft), 3m (≈9.8 ft), 5m (≈16.4 ft), 10m (≈32.8 ft), and 15m (≈49.2 ft) — so you can buy exactly what your project needs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include waterproofing marine wiring harnesses, sealing automotive connector splices, protecting outdoor low-voltage landscape lighting cables, and strain-relieving wire terminations on power tools and appliances. The yellow color also makes it easy to use as a visual identifier in color-coded wiring systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔌\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard round wire bundles, connectors, and terminals. Select the diameter closest to 3× your finished bundle size. Works with heat guns, soldering station hot-air attachments, and similar tools. Not recommended for use with open flame.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 3:1 Glue 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\u003eWaterproof Adhesive Inner Layer\u003c\/strong\u003e — The hot-melt glue lining melts during shrinking to form a moisture-resistant seal, making this tubing ideal for marine wiring, outdoor electrical connections, and automotive wire splices.\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 original inner diameter, providing far greater coverage than standard 2:1 tubing and conforming tightly to 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\u003eYellow Color for Easy Identification\u003c\/strong\u003e — The bright yellow outer jacket serves as a visual marker in color-coded wiring harnesses, helping technicians quickly identify circuits during installation and maintenance.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStrain Relief at Terminations\u003c\/strong\u003e — The bonded adhesive layer adds mechanical support at wire termination points, reducing flex fatigue and extending the service life of connections subject to vibration or repeated movement.\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 — Available from φ1.6mm to φ39mm in diameter, covering everything from fine instrument wiring to large-gauge power cables, with multiple length options to minimize waste on any job.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧪\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePolyolefin Outer Jacket\u003c\/strong\u003e — The outer wall is made from cross-linked polyolefin, which is resistant to oils, solvents, and moderate UV exposure — a practical choice for underhood automotive use and outdoor low-voltage wiring projects.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 3:1 Adhesive 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 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\u003eYellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Material\u003c\/th\u003e\n\u003ctd\u003eCross-linked Polyolefin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Lining\u003c\/th\u003e\n\u003ctd\u003eThermoplastic Adhesive (Hot-Melt Glue)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters (Before Shrink)\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 (≈3.3 ft), 3m (≈9.8 ft), 5m (≈16.4 ft), 10m (≈32.8 ft), 15m (≈49.2 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 90–120°C (194–248°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Tool\u003c\/th\u003e\n\u003ctd\u003eHeat gun (concentrator nozzle recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eMarine wiring, automotive splices, outdoor low-voltage cables, wire termination strain relief\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\u003eWall Thickness (After Shrink)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eSizing Note:\u003c\/strong\u003e Choose a starting diameter approximately 3× the final bundle diameter you need. If your wire bundle measures 4mm finished, select the φ12.7mm size. When between sizes, size up for easier installation.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right diameter for my wires?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outer diameter of your wire bundle before shrinking. With a 3:1 shrink ratio, the tubing should start at roughly 3 times the final diameter you need. For example, if your bundle measures 4mm after insulation, choose the φ12.7mm size. When in doubt, size up — you can always shrink tighter, but you cannot expand tubing that is too small.\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 uses a 3:1 shrink ratio, meaning it shrinks to approximately one-third of its original inner diameter when heat is applied. This is generally more than double the coverage of standard 2:1 tubing, making it suitable for irregular shapes, stepped connectors, and situations where a tight, conforming seal is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this heat shrink tubing actually waterproof?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The inner wall is lined with a thermoplastic adhesive (hot-melt glue) that melts and flows during shrinking to create a moisture-resistant seal around the wire or connector. This makes it suitable for outdoor, marine, and automotive applications where moisture ingress is a concern. For full submersion applications, confirm suitability with your specific use case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing outdoors or on a boat?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The adhesive glue lining provides a seal that resists moisture, dust, and mild chemical exposure. It is generally suitable for outdoor wiring, marine boat wiring, and automotive underhood use. For prolonged saltwater submersion or extreme chemical environments, confirm the specific operating conditions against your application requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat temperature do I need to shrink this tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTypically, a heat gun set to around 90–120°C (194–248°F) is sufficient to begin shrinking. Full adhesive activation generally occurs at around 120°C (248°F). Avoid open flames, which can scorch the tubing unevenly. A heat gun with a concentrator nozzle gives the most consistent results, especially on smaller diameters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between this and standard 2:1 heat shrink tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStandard 2:1 tubing shrinks to half its original diameter and typically has no adhesive lining. This 3:1 glue-lined tubing shrinks to one-third its original diameter and includes an inner adhesive layer that bonds to the substrate, providing a waterproof, strain-relieved seal. It is the better choice for connectors, splices, and any outdoor or marine wiring where a plain sleeve would not provide adequate protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the yellow color UV-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe yellow polyolefin outer jacket is generally resistant to moderate UV exposure. For extended direct sunlight applications, additional UV protection or conduit is recommended. The yellow color also serves as a practical visual identifier in wiring harnesses where color-coding is used to distinguish circuits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and length 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":52330168811794,"sku":"GLFBLFFGLBZSJ000363x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"φ2.4mm \/ 1m","offer_id":52330168844562,"sku":"GLFBLFFGLBZSJ000371x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"φ3.2mm \/ 1m","offer_id":52330168877330,"sku":"GLFBLFFGLBZSJ000378x1","price":3.06,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ 1m","offer_id":52330168910098,"sku":"GLFBLFFGLBZSJ000385x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"φ4.8mm \/ 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