120PCS Solder Seal Wire Connectors - Sopoby Heat Shrink Waterproof Butt Connector Kit Insulated Automotive Marine Electrical Wire Terminals

I had success by applying flux to the wires after twisting them together. I then slide the connector over the wires and heat to 400C while rotating the wires and connector to keep the heat even. I could see the solder flowing into the wire strands. Without the flux, I did not see the solder flow and was unsure if the solder melted.

Skip the process of having to plug up your soldering tool and pulling out solder when you have this, you can just slip on the wire and just simply apply heat and gun to it. Wire is protected water tight seal super tight solder the best invention ever the wires.

This is a nice assortment of connectors, have not used too many yet so I can't do as good of a review as I would like.

Good wiring product, working well

I have used several of these connectors for different projects, including adding accessories to my RZR and fixing various appliances around the house. One of the standout features of this kit is its ease of use. The solder seal connectors create a strong, waterproof bond without the need for complicated crimping tools, making my work faster and more efficient.These connectors provide a secure connection that holds up well, even in tough conditions. I was particularly impressed with how well they performed when used on my RZR, where they faced exposure to vibrations, dirt, and moisture—yet the connections remained intact and reliable. For appliance repairs, the heat shrink design ensures a tight, insulated seal that has given me peace of mind knowing that the electrical work is protected.Overall, this kit has proven to be an invaluable addition to my toolkit. Whether for automotive, marine, or household electrical projects, these connectors have consistently delivered quality results. If you need dependable, high-quality wire terminals that are waterproof and easy to use, I highly recommend giving this product a try.

This definitely beats having to use soldering wire and soldering gun. It works great if you follow the instruction and do it right.- Usee a proper heat gun.- Medium to Mid-Hi Heat.- stay between 4 to 6 inches from the wire and slightly move the heat from end to end to spread the heat from the soldering point and the colores plastic rings that will seal the wire making it water tight.- do not twist the wires together, open them and mate them together in an interlocking way. This will allow the soldering to penetrate through the wires and make a secure and solid soldering.- if you see the outer layer get dark or the soldering start to bubble, back off the heat gut. You are too close.- you will see the soldering melt and go through the wires and also the colored plastic spread as it melts. At that point the shrink tube should have shrunk and create a tight seal.- You are done.!! This should no take any more than 45 sec. to 1min.-You are done!If you twist the wires individually and twist them together the soldering will not penetrate. If you are too close, concentrating the heat in one spot or heat gun is to close, you will either burn the soldering tube, the wire insulation or melt the shrinking layer. If you are to cool of to far it will not melt the soldering material all the way.Follow this steps and you'll be ok. It does work !!

These 120 solder seal wire connectors are a fantastic addition to my toolkit. They are easy to use, providing a strong and reliable connection with minimal effort. The heat shrink and solder design creates a secure seal that holds up well, even in demanding environments. They’ve saved me time and hassle compared to traditional soldering methods. A great product for DIY electrical projects or professional use. Highly recommended!

The shrink tube works great,the solder not so much