{"product_id":"clear-dual-wall-heat-shrink-tubing-4-1-ratio-adhesive-glue-4mm-40mm","title":"Clear Dual-Wall Heat Shrink Tubing 4:1 Ratio with Adhesive Glue | 4mm–40mm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eClear Dual-Wall Heat Shrink Tubing with 4:1 Ratio — Seal, Protect \u0026amp; Insulate in One Step\u003c\/h2\u003e\n\u003cp\u003eExposed wire splices, corroded connectors, and unprotected cable ends are a constant headache for electricians, marine technicians, automotive enthusiasts, and serious DIYers. One failed seal in a wet environment can mean a short circuit, a dead trailer harness, or a costly repair. This clear dual-wall heat shrink tubing with 4:1 shrink ratio and built-in adhesive glue liner solves that problem with a single, reliable sleeve.\u003c\/p\u003e\n\u003cp\u003eEach piece is a dual-wall construction: an outer polyolefin sleeve that shrinks to 1\/4 of its original diameter, and an inner thermoplastic adhesive layer that melts and flows to form a watertight bond around your cable. Available in nine diameters — φ4mm (≈5\/32\"), φ6mm (≈1\/4\"), φ8mm (≈5\/16\"), φ12mm (≈15\/32\"), φ16mm (≈5\/8\"), φ20mm (≈25\/32\"), φ24mm (≈15\/16\"), φ32mm (≈1-1\/4\"), and φ40mm (≈1-9\/16\") — and in 1M (≈3.3 ft), 5M (≈16.4 ft), and 10M (≈32.8 ft) lengths to match your project scale.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include waterproofing marine wire splices and battery terminals, sealing automotive and trailer wiring harnesses against road moisture and vibration, protecting outdoor solar panel cable connections, and adding strain relief to industrial cable assemblies. The clear wall lets you inspect the adhesive flow and wire position without cutting the sleeve — a practical advantage on any job site.\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 cables, wires, and connectors within the listed pre-shrink inner diameter range. Confirm your cable's outer diameter before ordering — the supplied (open) diameter must exceed your cable OD. Works with heat guns; open flame not recommended.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Clear Dual-Wall 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 Liner\u003c\/strong\u003e — The inner glue layer melts during heating and flows around the cable jacket, creating a moisture-resistant seal ideal for marine wiring and outdoor electrical connections.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔍\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eClear Wall for Visual Inspection\u003c\/strong\u003e — Transparent outer sleeve lets you confirm wire seating and adhesive coverage after shrinking, without cutting the tubing open — useful for quality checks on critical connections.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e4:1 Shrink Ratio\u003c\/strong\u003e — Recovers to approximately 25% of the supplied diameter, accommodating a wider range of cable sizes per piece compared to standard 2:1 tubing — fewer SKUs needed on the job.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDual-Wall Polyolefin Construction\u003c\/strong\u003e — Outer layer provides electrical insulation and abrasion resistance; inner adhesive layer bonds to the cable jacket for corrosion protection on automotive and industrial wiring repairs.\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 — φ4mm to φ40mm\u003c\/strong\u003e — Nine diameter options cover everything from thin signal wires to large battery cables and conduit, available in 1M, 5M, and 10M lengths to reduce waste on larger runs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStrain Relief \u0026amp; Vibration Resistance\u003c\/strong\u003e — The bonded adhesive layer stiffens the transition zone at splices and connectors, reducing flex fatigue and chafing in high-vibration environments like engine bays and trailer frames.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Dual-Wall 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\u003eType\u003c\/th\u003e\n\u003ctd\u003eDual-Wall Heat Shrink Tubing with Adhesive Glue Liner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWall Construction\u003c\/th\u003e\n\u003ctd\u003eOuter: Polyolefin; Inner: Thermoplastic Adhesive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eClear (transparent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e4:1 (recovers to ~25% of supplied inner diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters (pre-shrink)\u003c\/th\u003e\n\u003ctd\u003eφ4mm (≈5\/32\"), φ6mm (≈1\/4\"), φ8mm (≈5\/16\"), φ12mm (≈15\/32\"), φ16mm (≈5\/8\"), φ20mm (≈25\/32\"), φ24mm (≈15\/16\"), φ32mm (≈1-1\/4\"), φ40mm (≈1-9\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1M (≈3.3 ft), 5M (≈16.4 ft), 10M (≈32.8 ft)\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) onset; full recovery at ~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 (medium-high setting); open flame not recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eMarine wiring, automotive harnesses, outdoor solar cables, industrial cable assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdhesive Seal\u003c\/th\u003e\n\u003ctd\u003eWatertight when properly applied; see variant options for diameter-specific recovered ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm for your application\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 The diameter listed is the \u003cem\u003epre-shrink\u003c\/em\u003e inner diameter. Your cable's outer diameter must be smaller than this value for the tubing to slide on. After heating, the tubing will recover to approximately 1\/4 of the listed size. If you are unsure, size up one step or contact us to confirm.\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 wire or cable?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outer diameter of your cable or connector before shrinking. The tubing's supplied (pre-shrink) inner diameter should be at least 1.1× the cable diameter to allow easy insertion. With a 4:1 shrink ratio, the final recovered diameter will be approximately 25% of the supplied size — for example, φ8mm tubing typically recovers to about 2mm. When in doubt, size up one step.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat temperature is needed to shrink this tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDual-wall adhesive heat shrink tubing generally activates at around 70–90°C (158–194°F) and fully recovers at approximately 120–135°C (248–275°F). A heat gun set to medium-high is typically sufficient. Avoid open flames, which can scorch the tubing or cause uneven shrinkage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this tubing waterproof and suitable for outdoor or marine use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The inner adhesive glue layer melts and flows during heating, creating a watertight seal around the cable. This makes it well-suited for marine wiring, outdoor electrical connections, and any application where moisture ingress is a concern.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between single-wall and dual-wall heat shrink tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSingle-wall tubing provides insulation and strain relief but no moisture seal. Dual-wall tubing adds an inner layer of thermoplastic adhesive that bonds to the cable jacket when heated, providing a fully sealed, corrosion-resistant connection — essential for harsh environments like marine, automotive underhood, and outdoor installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing in automotive or engine-bay applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGenerally yes. Dual-wall adhesive heat shrink tubing is commonly used in automotive wiring repairs, trailer harnesses, and underhood connections. The adhesive liner helps resist vibration-induced chafing and moisture. Verify the operating temperature range against your specific application before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy choose clear tubing over black or colored heat shrink?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eClear tubing lets you visually inspect the connection after installation — you can confirm the wire is properly seated and the adhesive has flowed evenly without cutting the sleeve open. It also works well for color-coded wiring where you want to preserve wire identification after the repair.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow much length should I allow when cutting pieces?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn most cases, cut the tubing 10–15mm (≈1\/2\") longer than the area you need to cover on each end. This overlap ensures the adhesive seals fully over the cable jacket rather than stopping at the edge of the splice or connector.\u003c\/p\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":"φ4mm \/ 1M","offer_id":52329697804562,"sku":"GLFBNHHGLBZSJ000495x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"φ6mm \/ 1M","offer_id":52329697837330,"sku":"GLFBNHHGLBZSJ000500x1","price":3.11,"currency_code":"USD","in_stock":true},{"title":"φ8mm \/ 1M","offer_id":52329697870098,"sku":"GLFBNHHGLBZSJ000505x1","price":3.52,"currency_code":"USD","in_stock":true},{"title":"φ12mm \/ 1M","offer_id":52329697902866,"sku":"GLFBNHHGLBZSJ000510x1","price":4.34,"currency_code":"USD","in_stock":true},{"title":"φ16mm \/ 1M","offer_id":52329697935634,"sku":"GLFBNHHGLBZSJ000515x1","price":6.11,"currency_code":"USD","in_stock":true},{"title":"φ20mm \/ 1M","offer_id":52329697968402,"sku":"GLFBNHHGLBZSJ000519x1","price":7.55,"currency_code":"USD","in_stock":true},{"title":"φ24mm \/ 1M","offer_id":52329698001170,"sku":"GLFBNHHGLBZSJ000521x1","price":9.91,"currency_code":"USD","in_stock":true},{"title":"φ32mm \/ 1M","offer_id":52329698033938,"sku":"GLFBNHHGLBZSJ000523x1","price":11.68,"currency_code":"USD","in_stock":true},{"title":"φ40mm \/ 1M","offer_id":52329698066706,"sku":"GLFBNHHGLBZSJ097228x1","price":14.95,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ 5M","offer_id":52329698099474,"sku":"GLFBNHHGLBZSJ000495x5","price":7.19,"currency_code":"USD","in_stock":true},{"title":"φ6mm \/ 5M","offer_id":52329698132242,"sku":"GLFBNHHGLBZSJ000500x5","price":9.18,"currency_code":"USD","in_stock":true},{"title":"φ8mm \/ 5M","offer_id":52329698165010,"sku":"GLFBNHHGLBZSJ000505x5","price":12.36,"currency_code":"USD","in_stock":true},{"title":"φ12mm \/ 5M","offer_id":52329698197778,"sku":"GLFBNHHGLBZSJ000510x5","price":18.16,"currency_code":"USD","in_stock":true},{"title":"φ16mm \/ 5M","offer_id":52329698230546,"sku":"GLFBNHHGLBZSJ000515x5","price":26.78,"currency_code":"USD","in_stock":true},{"title":"φ20mm \/ 5M","offer_id":52329698263314,"sku":"GLFBNHHGLBZSJ000519x5","price":33.93,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ 10M","offer_id":52329698296082,"sku":"GLFBNHHGLBZSJ000495x10","price":13.4,"currency_code":"USD","in_stock":true},{"title":"φ6mm \/ 10M","offer_id":52329698328850,"sku":"GLFBNHHGLBZSJ000500x10","price":17.39,"currency_code":"USD","in_stock":true},{"title":"φ8mm \/ 10M","offer_id":52329698361618,"sku":"GLFBNHHGLBZSJ000505x10","price":23.87,"currency_code":"USD","in_stock":true},{"title":"φ12mm \/ 10M","offer_id":52329698394386,"sku":"GLFBNHHGLBZSJ000510x10","price":35.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of12_fb51ea4f-d00f-4173-9d9e-a74d0c84c9bf.jpg?v=1780560099","url":"https:\/\/homediyer.com\/products\/clear-dual-wall-heat-shrink-tubing-4-1-ratio-adhesive-glue-4mm-40mm","provider":"HomeDIYer","version":"1.0","type":"link"}