{"product_id":"heat-shrink-tubing-20mm-2-1-waterproof-cable-sleeving","title":"Non-Slip Heat Shrink Tubing 20mm – 2:1 Waterproof Cable Sleeving","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e20mm Heat Shrink Tubing — Waterproof 2:1 Cable Sleeving for Automotive \u0026amp; DIY Wiring\u003c\/h2\u003e\n\u003cp\u003eExposed wire splices, corroded connectors, and unprotected cable bundles are a constant headache for automotive enthusiasts, electricians, and DIYers alike. Whether you're repairing a wiring harness, tidying up a home workshop project, or protecting outdoor cable runs, you need a sleeving solution that seals reliably and stays put. This 20mm heat shrink tubing delivers a clean, professional finish every time.\u003c\/p\u003e\n\u003cp\u003eEach piece measures \u003cstrong\u003e20mm (≈0.79\") inner diameter\u003c\/strong\u003e before shrinking, with a \u003cstrong\u003e2:1 shrink ratio\u003c\/strong\u003e that recovers to approximately 10mm (≈0.39\") when heat is applied. Available in \u003cstrong\u003e1 metre lengths\u003c\/strong\u003e and five colors — Black, Red, Blue, Green, and Yellow — so you can color-code circuits or match your project's aesthetic. The tubing is constructed from flexible polyolefin with a waterproof design to resist moisture ingress.\u003c\/p\u003e\n\u003cp\u003eTypical applications include \u003cstrong\u003eautomotive wiring harness repair\u003c\/strong\u003e, connector insulation on marine and RV electrical systems, cable bundling in control panels, and protecting soldered joints in outdoor lighting installations. The non-slip surface helps keep the sleeve in position during application.\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 cable bundles and connectors up to approximately 18mm in diameter. Suitable for standard automotive, marine, and low-voltage electrical wiring applications. Verify your cable OD before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 20mm Heat Shrink Tubing Sleeves\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔥\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e2:1 Shrink Ratio\u003c\/strong\u003e — Recovers from 20mm to approximately 10mm (≈0.39\"), creating a snug, uniform fit around cables and connectors for reliable insulation.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWaterproof Seal\u003c\/strong\u003e — Designed to resist moisture penetration when fully shrunk, making it suitable for automotive wiring repair and outdoor cable protection.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e5-Color Selection\u003c\/strong\u003e — Available in Black, Red, Blue, Green, and Yellow for easy circuit color-coding in automotive, marine, and DIY electrical projects.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Polyolefin Construction\u003c\/strong\u003e — Remains pliable after shrinking, so it won't crack or stiffen in temperature-variable environments like engine bays or outdoor enclosures.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✂️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eEasy to Cut \u0026amp; Apply\u003c\/strong\u003e — Cut to any length with standard scissors; shrinks evenly with a heat gun at typical low-to-medium settings, no special tools required.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🚗\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eNon-Slip Exterior Texture\u003c\/strong\u003e — The textured outer surface helps the sleeve stay in place during heat application, reducing slippage on vertical or overhead cable runs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 20mm Heat Shrink Tubing\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (Before Shrink)\u003c\/th\u003e\n\u003ctd\u003e20mm (≈0.79\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (After Shrink)\u003c\/th\u003e\n\u003ctd\u003eApproximately 10mm (≈0.39\") — 2:1 ratio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e2:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength per Piece\u003c\/th\u003e\n\u003ctd\u003e1 Metre (≈39.4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003ePolyolefin (flexible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWaterproof\u003c\/th\u003e\n\u003ctd\u003eYes — moisture-resistant when fully shrunk\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Colors\u003c\/th\u003e\n\u003ctd\u003eBlack, Red, Blue, Green, Yellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 70–120°C (158–248°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Tool\u003c\/th\u003e\n\u003ctd\u003eHeat gun (low to medium setting)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Use\u003c\/th\u003e\n\u003ctd\u003eAutomotive wiring, cable bundling, connector insulation, outdoor electrical repair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompliance \/ Certifications\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\u003eSizing Note:\u003c\/strong\u003e Always measure your cable bundle's outer diameter before purchasing. The 20mm pre-shrink ID accommodates bundles up to approximately 18mm OD. For smaller cables, consider a smaller diameter tubing for a tighter finished fit.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat size wire or cable fits inside 20mm heat shrink tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis tubing has a \u003cstrong\u003e20mm (≈0.79\") inner diameter\u003c\/strong\u003e before shrinking. With a 2:1 shrink ratio, it recovers to approximately \u003cstrong\u003e10mm (≈0.39\")\u003c\/strong\u003e after heat is applied. It is generally suitable for cable bundles or connectors up to about 18mm in outer diameter. Always measure your cable bundle before ordering to ensure a proper fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this heat shrink tubing waterproof?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This tubing is designed to provide a \u003cstrong\u003ewaterproof seal\u003c\/strong\u003e when properly applied with a heat gun. It is suitable for outdoor and automotive environments where moisture resistance is required, including under-hood wiring and marine electrical connections.\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\u003eHeat shrink tubing of this type typically activates at around \u003cstrong\u003e70–120°C (158–248°F)\u003c\/strong\u003e. A standard heat gun set to low or medium is generally sufficient. Avoid using open flames such as lighters or torches, as these can cause uneven shrinkage, scorching, or damage to the tubing and underlying cable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing on automotive wiring?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — automotive wiring repair is one of the most common uses for this type of heat shrink sleeving. It works well for \u003cstrong\u003ewiring harness repair\u003c\/strong\u003e, connector insulation, protecting soldered joints, and bundling cables in engine bays, under-dash areas, and trailer wiring. The waterproof design helps protect connections from road moisture and vibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the color affect performance or shrink ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. All five color variants — Black, Red, Blue, Green, and Yellow — share the same \u003cstrong\u003e2:1 shrink ratio\u003c\/strong\u003e and waterproof properties. Color selection is typically used for \u003cstrong\u003ecolor-coding wiring circuits\u003c\/strong\u003e (e.g., red for positive, black for ground) or for visual identification in multi-cable installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length of heat shrink tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the total length of the cable section you need to cover, then add at least \u003cstrong\u003e10–15mm (≈0.5\") on each end\u003c\/strong\u003e for overlap to ensure a complete seal. Each piece in this listing is \u003cstrong\u003e1 metre (≈39.4\")\u003c\/strong\u003e, which can be cut to any shorter length with standard scissors. For longer runs, multiple pieces can be applied end-to-end.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this tubing safe for indoor electrical use and RoHS compliant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis tubing is generally manufactured to meet standard electrical insulation requirements for low-voltage applications. For specific compliance certifications such as RoHS, UL, or CE, please \u003cstrong\u003econtact us to confirm\u003c\/strong\u003e before use in regulated or safety-critical applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003ecolor 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":"φ20mm \/ Black \/ 1 Metre","offer_id":52330373153042,"sku":"GYWXWGLBZSJ000568x1","price":2.43,"currency_code":"USD","in_stock":true},{"title":"φ20mm \/ Red \/ 1 Metre","offer_id":52330373185810,"sku":"GYWXWGLBZSJ000569x1","price":2.71,"currency_code":"USD","in_stock":true},{"title":"φ20mm \/ Blue \/ 1 Metre","offer_id":52330373218578,"sku":"GYWXWGLBZSJ000570x1","price":2.71,"currency_code":"USD","in_stock":true},{"title":"φ20mm \/ Green \/ 1 Metre","offer_id":52330373251346,"sku":"GYWXWGLBZSJ000571x1","price":2.71,"currency_code":"USD","in_stock":true},{"title":"φ20mm \/ Yellow \/ 1 Metre","offer_id":52330373284114,"sku":"GYWXWGLBZSJ000572x1","price":2.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/45f8192e-ba22-4c63-b131-8835bea3573b_1.jpg?v=1780905510","url":"https:\/\/homediyer.com\/products\/heat-shrink-tubing-20mm-2-1-waterproof-cable-sleeving","provider":"HomeDIYer","version":"1.0","type":"link"}