I bought this product to help me with rewiring. Heat shrink butt connectors are easy to use: connect two bare wires with heat shrink butt connectors, crimp and then shrink with a heat gun. I am very satisfied with the airtightness of the product: waterproof. The only problem I have is heat shrinkage. The plastic is really thick and needs a lot of heat to shrink properly. I don't have enough heat guns so I used a lighter. I think I should buy professional crimping tools and heat guns that will make my projects more enjoyable.
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