{"product_id":"7-9mm-heat-shrink-tubing-3-1-ratio-waterproof-electrical-sleeving","title":"7.9mm Heat Shrink Tubing 3:1 Ratio — Waterproof Electrical Cable Sleeving","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003ch2\u003e7.9mm Heat Shrink Tubing 3:1 — Reliable Waterproof Insulation for Every Wiring Job\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003cp\u003eExposed solder joints, frayed wire ends, and unprotected connectors are the silent culprits behind electrical failures — whether you are wiring a trailer, repairing an automotive harness, or tidying up a home workshop project. This 7.9mm heat shrink tubing with a 3:1 shrink ratio gives DIYers, electricians, and hobbyists a fast, clean way to insulate and protect connections without tape, messy compounds, or bulky connectors.\u003c\/p\u003e\n\u003cp\u003eEach order covers a single continuous length of tubing — available in 1m (approx. 3.3ft), 2m (approx. 6.6ft), 5m (approx. 16.4ft), or 10m (approx. 32.8ft) — in your choice of 8 colors: Black, White, Red, Green, Yellow, Blue, Transparent, or a color-coded mix. The inner diameter before shrinking is 7.9mm; after full heat recovery at a 3:1 ratio, the recovered diameter is typically around 2.6mm (approx. 0.10 inch). Wall thickness and exact recovered dimensions may vary slightly by color batch — see variant options for confirmation.\u003c\/p\u003e\n\u003cp\u003eTypical applications include automotive wiring harness repair, marine and trailer connector sealing, RC vehicle wiring, solar panel cable management, and workshop wire organization. The color variety makes it especially useful for circuit identification in multi-conductor installations and DIY electrical panel work.\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 wire bundles and connectors up to approximately 7.5mm in diameter before shrinking. Compatible with standard heat guns. Suitable for copper, aluminum, and multi-conductor cables. Not recommended for use with open flame tools.\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 inner diameter and wall thickness are based on typical 3:1 ratio performance. Confirm fit with your specific wire gauge before cutting to final length.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 7.9mm 3:1 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\u003e3:1 Shrink Ratio\u003c\/strong\u003e — Shrinks to approximately one-third of its original diameter, making it ideal for covering connectors, solder joints, and stepped cable transitions that standard 2:1 tubing cannot grip securely.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMoisture-Resistant Construction\u003c\/strong\u003e — Provides a tight, waterproof-grade seal around connections, protecting against corrosion in outdoor, automotive, and marine wiring environments.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e8 Color Options\u003c\/strong\u003e — Available in Black, White, Red, Green, Yellow, Blue, Transparent, and mixed sets for color-coded circuit identification in multi-wire installations and electrical panel work.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e4 Length Options\u003c\/strong\u003e — Choose from 1m, 2m, 5m, or 10m to match your project scale, from single connector repairs to full wiring harness builds and workshop stock rolls.\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 and Apply\u003c\/strong\u003e — Cuts cleanly with standard scissors or a utility knife; shrinks evenly with a heat gun at typically 120 degrees C (248 degrees F) without cracking, splitting, or uneven bunching.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eElectrical Insulation Performance\u003c\/strong\u003e — Provides dielectric insulation around wire joints and terminals, reducing the risk of short circuits in automotive, marine, and low-voltage DIY electrical projects.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 7.9mm 3:1 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\u003e7.9mm (approx. 0.31 inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecovered Inner Diameter (After Shrink)\u003c\/th\u003e\n\u003ctd\u003eTypically approx. 2.6mm (approx. 0.10 inch) at full 3:1 recovery\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\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1m (approx. 3.3ft) \/ 2m (approx. 6.6ft) \/ 5m (approx. 16.4ft) \/ 10m (approx. 32.8ft)\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\u003eShrink Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically begins at approx. 70-90 degrees C (158-194 degrees F); full recovery at approx. 120 degrees C (248 degrees F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWall Thickness\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003ePolyolefin (typical for 3:1 heat shrink tubing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication Method\u003c\/th\u003e\n\u003ctd\u003eHeat gun recommended; open flame not recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Use\u003c\/th\u003e\n\u003ctd\u003eAutomotive, marine, trailer wiring, DIY electrical, wire organization\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWaterproof\u003c\/th\u003e\n\u003ctd\u003eMoisture-resistant; contact us to confirm for fully submerged use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\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 length of heat shrink tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the section of wire or connector you need to cover, then add at least 10-15% extra to account for shrinkage along the length. For runs over 1 metre, consider ordering the 2m or 5m option to avoid mid-run joints. The 10m roll is ideal for workshop stock or larger wiring projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does 3:1 shrink ratio mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA 3:1 shrink ratio means the tubing will shrink to approximately one-third of its original inner diameter when heat is applied. For this 7.9mm tubing, the recovered inner diameter is typically around 2.6mm, making it suitable for a wide range of wire gauges and connector bodies.\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 moisture-resistant seal when properly applied. It is generally suitable for outdoor wiring, marine connections, and automotive use where exposure to moisture, dust, or mild chemicals is expected. For fully submerged applications, confirm suitability with your specific use case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat wire gauges does 7.9mm heat shrink tubing fit?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBefore shrinking, the 7.9mm inner diameter typically accommodates wire bundles, connectors, or cables up to approximately 7.5mm in diameter. After shrinking at a 3:1 ratio, it recovers to around 2.6mm. This makes it well-suited for covering multi-conductor cables, solder joints, and medium-gauge wire terminals.\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\u003eThis tubing generally begins to shrink at around 70-90 degrees C (158-194 degrees F) and fully recovers at approximately 120 degrees C (248 degrees F). A heat gun is the recommended tool. Avoid open flames, which can cause uneven shrinkage or scorching.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing in automotive or marine wiring?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, this heat shrink tubing is generally suitable for automotive wiring harnesses, trailer connectors, boat wiring, and similar environments. Its moisture-resistant construction helps protect connections from corrosion and vibration-related wear. Always verify the operating temperature range matches your application before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the color affect performance?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo — color is purely for identification and organization purposes. All color variants share the same 3:1 shrink ratio, wall thickness, and waterproof properties. Color-coding is commonly used in wiring projects to distinguish circuits, phases, or wire functions at a glance.\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 \/ φ7.9mm \/ 1 Metre","offer_id":52330359226642,"sku":"GYWXWGYWXWGLBZSJ000402x1x","price":2.16,"currency_code":"USD","in_stock":true},{"title":"White \/ φ7.9mm \/ 1 Metre","offer_id":52330359259410,"sku":"GYWXWGYWXWGLBZSJ000403x1x","price":2.38,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ7.9mm \/ 1 Metre","offer_id":52330359292178,"sku":"GYWXWGYWXWGLBZSJ000404x1x","price":2.38,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ7.9mm \/ 1 Metre","offer_id":52330359324946,"sku":"GYWXWGYWXWGLBZSJ000405x1x","price":2.38,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ7.9mm \/ 1 Metre","offer_id":52330359357714,"sku":"GYWXWGYWXWGLBZSJ000406x1x","price":2.38,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ7.9mm \/ 1 Metre","offer_id":52330359390482,"sku":"GYWXWGYWXWGLBZSJ000407x1x","price":2.38,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ7.9mm \/ 1 Metre","offer_id":52330359423250,"sku":"GYWXWGYWXWGLBZSJ000408x1x","price":2.38,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ7.9mm \/ 2 Metre","offer_id":52330359456018,"sku":"GYWXWGYWXWGLBZSJ000402x2x","price":3.85,"currency_code":"USD","in_stock":true},{"title":"White \/ φ7.9mm \/ 2 Metre","offer_id":52330359488786,"sku":"GYWXWGYWXWGLBZSJ000403x2x","price":4.03,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ7.9mm \/ 2 Metre","offer_id":52330359521554,"sku":"GYWXWGYWXWGLBZSJ000404x2x","price":4.03,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ7.9mm \/ 2 Metre","offer_id":52330359554322,"sku":"GYWXWGYWXWGLBZSJ000405x2x","price":4.03,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ7.9mm \/ 2 Metre","offer_id":52330359587090,"sku":"GYWXWGYWXWGLBZSJ000406x2x","price":4.03,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ7.9mm \/ 2 Metre","offer_id":52330359619858,"sku":"GYWXWGYWXWGLBZSJ000407x2x","price":4.03,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ7.9mm \/ 2 Metre","offer_id":52330359652626,"sku":"GYWXWGYWXWGLBZSJ000408x2x","price":4.03,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ7.9mm \/ 5 Metre","offer_id":52330359685394,"sku":"GYWXWGYWXWGLBZSJ000402x5x","price":8.51,"currency_code":"USD","in_stock":true},{"title":"White \/ φ7.9mm \/ 5 Metre","offer_id":52330359718162,"sku":"GYWXWGYWXWGLBZSJ000403x5x","price":8.95,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ7.9mm \/ 5 Metre","offer_id":52330359750930,"sku":"GYWXWGYWXWGLBZSJ000404x5x","price":8.95,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ7.9mm \/ 5 Metre","offer_id":52330359783698,"sku":"GYWXWGYWXWGLBZSJ000405x5x","price":8.95,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ7.9mm \/ 5 Metre","offer_id":52330359816466,"sku":"GYWXWGYWXWGLBZSJ000406x5x","price":8.95,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ7.9mm \/ 5 Metre","offer_id":52330359849234,"sku":"GYWXWGYWXWGLBZSJ000407x5x","price":8.95,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ7.9mm \/ 5 Metre","offer_id":52330359882002,"sku":"GYWXWGYWXWGLBZSJ000408x5x","price":8.95,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ7.9mm \/ 10 Metre","offer_id":52330359914770,"sku":"GYWXWGYWXWGLBZSJ000402x10x","price":16.31,"currency_code":"USD","in_stock":true},{"title":"White \/ φ7.9mm \/ 10 Metre","offer_id":52330359947538,"sku":"GYWXWGYWXWGLBZSJ000403x10x","price":17.18,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ7.9mm \/ 10 Metre","offer_id":52330359980306,"sku":"GYWXWGYWXWGLBZSJ000404x10x","price":17.18,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ7.9mm \/ 10 Metre","offer_id":52330360013074,"sku":"GYWXWGYWXWGLBZSJ000405x10x","price":17.18,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ7.9mm \/ 10 Metre","offer_id":52330360045842,"sku":"GYWXWGYWXWGLBZSJ000406x10x","price":17.18,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ7.9mm \/ 10 Metre","offer_id":52330360078610,"sku":"GYWXWGYWXWGLBZSJ000407x10x","price":17.18,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ7.9mm \/ 10 Metre","offer_id":52330360111378,"sku":"GYWXWGYWXWGLBZSJ000408x10x","price":17.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_3d6db03d-d911-4992-9a68-0cc56d818fe8.jpg?v=1780564594","url":"https:\/\/homediyer.com\/products\/7-9mm-heat-shrink-tubing-3-1-ratio-waterproof-electrical-sleeving","provider":"HomeDIYer","version":"1.0","type":"link"}