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The perfect solder seal connectors to keep your wires safe for YEARS to come, and avoid damage from age and water corrosion through our connectors' strong waterproof insulation. How to Use Wire Connectors: 1. Position wires into solder splice 2. Apply recommended heat stated in below specifications 3. Tubing will shrink and solder will melt and flow through the stripped wires Specification: Shrinkage ratio is 2:1 Minimum temperature for solder to melt: 138°C Minimum shrink temperature: 80°C Operating temperature :-55℃ - 125℃ Shrink temperature : >160℃ Sizes: 70 x White Connectors: Diameter 1.7 mm, Cable cross-section 0.25-0.34 mm²(A.W.G.:26-24). 100 x Blue Connectors: Diameter 4.5mm, Cable cross-section 1.5-2.5 mm² (A.W.G.:16-14); 100 x Red Connectors: Diameter 2.7 mm, Cable cross-section 0.5-1.0 mm² (A.W.G.:22-18); 30 x Yellow Connectors: Diameter 6.0 mm, Cable cross-section 4.0-6.0 mm² (A.W.G.:12-10) Features: Polyolefin Tubing with Solder inside.Strong waterproof seal prevents wires from corrosion. Transparent sleeve provides easy visual inspection before applying heat.No wire damage due to lower shrink temperature.Compliant with ROHS, ISO 9001:2008, SGS and CE standards. Tips & Guarantees : ① For better results use a hot air gun to avoid melting the heat shrink tubing before the solder.② 60 days money back guarantee; no questions asked!