{"product_id":"black-adhesive-heat-shrink-tubing-4-1-waterproof-glue-lined-sleeving","title":"Black Adhesive Heat Shrink Tubing 4:1 Ratio — Waterproof Glue-Lined Sleeving (4mm–40mm)","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eAdhesive Heat Shrink Tubing 4:1 — Waterproof Dual-Wall Sleeving for Reliable Wire Protection\u003c\/h2\u003e\n\u003cp\u003eExposed wire connections in boats, trailers, automotive builds, and outdoor electrical panels are constantly at risk from moisture, vibration, and corrosion. Whether you're a marine electrician sealing battery terminals or a DIYer protecting a trailer harness splice, standard heat shrink simply isn't enough — you need a glue-lined solution that bonds, seals, and stays put.\u003c\/p\u003e\n\u003cp\u003eEach piece of this dual-wall heat shrink tubing features a polyolefin outer wall and a thermoplastic adhesive inner liner. Available in diameters from 4mm (5\/32\") to 40mm (1-9\/16\"), the 4:1 shrink ratio means the tubing collapses to roughly one-quarter of its supplied size, conforming tightly around connectors, splices, and irregular shapes. Pack sizes of 1, 2, or 5 pieces let you order exactly what your project requires.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include sealing marine wire connectors and battery lugs, protecting automotive wiring harness splices from road moisture, and waterproofing outdoor junction box entries — all scenarios where a watertight, strain-relieved connection is critical.\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, ring terminals, butt connectors, and cable lugs. Verify the supplied (before-shrink) diameter fits loosely over your connector before applying heat. Shrink ratio is 4:1 — see size guide in FAQ below.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Adhesive Heat Shrink Tubing Pieces\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 Glue-Lined Inner Wall\u003c\/strong\u003e — The thermoplastic adhesive melts and flows during shrinking, sealing around wires and connectors to block moisture ingress in marine and outdoor wiring applications.\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 — Shrinks to approximately 25% of its original diameter, providing a tighter, more conforming fit than standard 2:1 tubing — ideal for stepped connectors and irregular bundle shapes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Diameter Range (4mm–40mm)\u003c\/strong\u003e — Covers everything from thin signal wires to heavy battery cables, so you can source the right waterproof heat shrink sleeving for small and large connectors in one place.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDual-Wall Construction\u003c\/strong\u003e — The outer polyolefin layer provides mechanical abrasion resistance and electrical insulation, while the inner adhesive layer delivers strain relief and a corrosion-resistant seal.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Sizes (1, 2, or 5 Pieces)\u003c\/strong\u003e — Order a single piece for a one-off repair or a 5-pack for ongoing automotive or marine wiring projects — no need to buy a full spool when you only need a few lengths.\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 a standard heat gun at typically 120–150°C (250–300°F); no open flame required, reducing the risk of scorching during installation.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 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 Glue-Lined Heat Shrink Tubing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e4:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e4mm (5\/32\"), 6mm (15\/64\"), 8mm (5\/16\"), 12mm (15\/32\"), 16mm (5\/8\"), 20mm (25\/32\"), 24mm (15\/16\"), 32mm (1-1\/4\"), 40mm (1-9\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Size Options\u003c\/th\u003e\n\u003ctd\u003e1 Piece, 2 Piece, 5 Piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Wall Material\u003c\/th\u003e\n\u003ctd\u003ePolyolefin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Liner\u003c\/th\u003e\n\u003ctd\u003eThermoplastic Adhesive (Hot-Melt Glue)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 120–150°C (250–300°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength per Piece\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuitable Environments\u003c\/th\u003e\n\u003ctd\u003eMarine, automotive, outdoor electrical, industrial\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\u003eVoltage Rating\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 wire bundle or connector outer diameter before ordering. The diameter listed is the \u003cem\u003esupplied (before-shrink)\u003c\/em\u003e size. After full shrink, the inner diameter will be approximately one-quarter of the listed size.\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 4:1 shrink ratio, the tubing will shrink to roughly one-quarter of its supplied diameter. For example, a 16mm (5\/8\") tube will shrink down to approximately 4mm. Choose a size that fits loosely over your connector or bundle before heat is applied.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat shrink ratio does this tubing use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis tubing uses a 4:1 shrink ratio, meaning it will shrink to approximately 25% of its original diameter when heat is applied. This is significantly more than standard 2:1 tubing, making it well-suited for irregular shapes, large connectors, and stepped transitions.\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. The inner wall is lined with a thermoplastic adhesive (hot-melt glue) that melts and flows when heat is applied, sealing around wires and connectors to create a watertight barrier. It is generally suitable for marine, automotive, and outdoor electrical applications.\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\u003eTypically, a heat gun set to around 120–150°C (250–300°F) is sufficient to activate both the shrink and the adhesive liner. Avoid using an open flame, as uneven heat can scorch the tubing or cause incomplete adhesive flow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing outdoors or in marine environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The glue-lined dual-wall construction provides resistance to moisture, mild chemicals, and UV exposure in most cases. It is commonly used for boat wiring, trailer harnesses, and outdoor junction protection. For prolonged submersion, confirm suitability with your specific application requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat wire gauges or connector sizes does each diameter fit?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAs a general guide: 4mm (5\/32\") suits small wires and thin connectors; 8mm (5\/16\") fits mid-range wire bundles; 16mm (5\/8\") covers larger connectors and multi-wire looms; 32mm (1-1\/4\") and 40mm (1-9\/16\") are typically used for battery cables, large marine connectors, and heavy-gauge wiring. See variant options for the full size range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow does dual-wall tubing differ from standard single-wall heat shrink?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStandard single-wall heat shrink provides mechanical protection and insulation but does not seal against moisture. Dual-wall (glue-lined) tubing adds an inner adhesive layer that bonds to the wire or connector surface, creating a sealed, strain-relieved connection that resists water ingress, vibration, and corrosion.\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 pack size\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"4mm \/ 1 Piece","offer_id":52329738830098,"sku":"ZXCGZYYSG0588x1","price":4.08,"currency_code":"USD","in_stock":true},{"title":"6mm \/ 1 Piece","offer_id":52329738862866,"sku":"ZXCGZYYSG0589x1","price":4.24,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 1 Piece","offer_id":52329738895634,"sku":"ZXCGZYYSG0590x1","price":4.42,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 1 Piece","offer_id":52329738928402,"sku":"ZXCGZYYSG0591x1","price":4.81,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 1 Piece","offer_id":52329738961170,"sku":"ZXCGZYYSG0592x1","price":5.18,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 1 Piece","offer_id":52329738993938,"sku":"ZXCGZYYSG0593x1","price":5.74,"currency_code":"USD","in_stock":true},{"title":"24mm \/ 1 Piece","offer_id":52329739026706,"sku":"ZXCGZYYSG0594x1","price":6.13,"currency_code":"USD","in_stock":true},{"title":"32mm \/ 1 Piece","offer_id":52329739059474,"sku":"ZXCGZYYSG0595x1","price":6.41,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 1 Piece","offer_id":52329739092242,"sku":"ZXCGZYYSG0596x1","price":7.74,"currency_code":"USD","in_stock":true},{"title":"4mm \/ 2 Piece","offer_id":52329739125010,"sku":"ZXCGZYYSG0588x2","price":4.42,"currency_code":"USD","in_stock":true},{"title":"6mm \/ 2 Piece","offer_id":52329739157778,"sku":"ZXCGZYYSG0589x2","price":4.81,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 2 Piece","offer_id":52329739190546,"sku":"ZXCGZYYSG0590x2","price":5.07,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 2 Piece","offer_id":52329739223314,"sku":"ZXCGZYYSG0591x2","price":5.83,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 2 Piece","offer_id":52329739256082,"sku":"ZXCGZYYSG0592x2","price":6.73,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 2 Piece","offer_id":52329739288850,"sku":"ZXCGZYYSG0593x2","price":7.74,"currency_code":"USD","in_stock":true},{"title":"24mm \/ 2 Piece","offer_id":52329739321618,"sku":"ZXCGZYYSG0594x2","price":8.57,"currency_code":"USD","in_stock":true},{"title":"32mm \/ 2 Piece","offer_id":52329739354386,"sku":"ZXCGZYYSG0595x2","price":9.63,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 2 Piece","offer_id":52329739387154,"sku":"ZXCGZYYSG0596x2","price":13.57,"currency_code":"USD","in_stock":true},{"title":"4mm \/ 5 Piece","offer_id":52329739419922,"sku":"ZXCGZYYSG0588x5","price":5.41,"currency_code":"USD","in_stock":true},{"title":"6mm \/ 5 Piece","offer_id":52329739452690,"sku":"ZXCGZYYSG0589x5","price":6.41,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 5 Piece","offer_id":52329739485458,"sku":"ZXCGZYYSG0590x5","price":7.07,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 5 Piece","offer_id":52329739518226,"sku":"ZXCGZYYSG0591x5","price":9.13,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 5 Piece","offer_id":52329739550994,"sku":"ZXCGZYYSG0592x5","price":12.54,"currency_code":"USD","in_stock":true},{"title":"20mm \/ 5 Piece","offer_id":52329739583762,"sku":"ZXCGZYYSG0593x5","price":15.37,"currency_code":"USD","in_stock":true},{"title":"24mm \/ 5 Piece","offer_id":52329739616530,"sku":"ZXCGZYYSG0594x5","price":17.35,"currency_code":"USD","in_stock":true},{"title":"32mm \/ 5 Piece","offer_id":52329739649298,"sku":"ZXCGZYYSG0595x5","price":21.5,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 5 Piece","offer_id":52329739682066,"sku":"ZXCGZYYSG0596x5","price":31.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_22d1abde-fcc5-4401-9b05-30ee025effb2.jpg?v=1780565178","url":"https:\/\/homediyer.com\/products\/black-adhesive-heat-shrink-tubing-4-1-waterproof-glue-lined-sleeving","provider":"HomeDIYer","version":"1.0","type":"link"}