400PCS Solder Seal Wire Connectors, Sopoby Self Soldering Heat Shrink Butt Connector Solder Sleeve Waterproof Insulated Electrical Butt Splice Wire Terminals for Marine Automotive Boat Truck

These little things are amazing. I had never seen such a thing before I bought them. If you need to join two wires and have the connection be as strong and reliable as the wire itself (if not more so), these connectors are perfect. I've used so many of them that I had to buy more of the smallest ones (white and red). I use them all the time.

I've been using these 400PCS Solder Seal Wire Connectors for various electrical projects, and I'm thoroughly impressed with their performance. Here's my take on how to get the best out of these connectors, following some trial and error and considering other reviews.Optimal Heat Setting: A crucial tip for anyone using these solder seal wire connectors is to set your heat gun to a precise temperature. I've found that 550 degrees Fahrenheit is the sweet spot. This temperature allows the solder to melt perfectly while also activating the glue without damaging the connector itself. It’s a critical step to ensure a strong, reliable seal.Application Technique: The technique you use during application significantly affects the outcome. Start by heating the outer portion of the connector where the glue resides. This approach secures the wire in place first, which prevents any slipping while you’re working on the solder. Once the outer sleeve is adequately shrunk and the wire is secured, you can then focus on melting the solder evenly around the wire. This method ensures a robust and evenly distributed connection.Performance and Reliability: These connectors are excellent for creating strong, weather-proof seals in wiring projects. Whether you're working on automotive wiring, marine electronics, or home repairs, these connectors provide a dependable solution. They save time compared to traditional soldering methods, and when done correctly, the results are both aesthetically pleasing and electrically sound.User Experience: I’ve noticed some reviews mentioning issues with melting or the connectors not holding well. From my experience, these issues are largely due to incorrect heat settings or application techniques. When used correctly, these connectors perform exceptionally well. Make sure to rotate the wire gently and evenly as you apply heat to distribute the solder and glue properly.Final Thoughts: Overall, the 400PCS Solder Seal Wire Connectors kit is a fantastic choice for DIY enthusiasts and professionals alike. They offer a quick, clean, and reliable method for connecting wires without the fuss of crimp tools or soldering irons. Just remember to use the correct heat settings and apply heat properly to achieve the best results.If you’re looking for efficient, reliable, and easy-to-use wire connectors, I highly recommend giving these a try. Just follow the tips for heating, and you'll likely find these connectors to be a game-changer in your electrical projects.

Water proof and amazing quality and easy to use and would recommend getting like 2 or 3 boxes because when doing wiring you tend to use a lot!

These have been working great in place of the old fashion wire connectors. I did buy a butane torch just for heating these. I tried using just a lighter, but it the heat was not uniform across the connector. The butane torch is nice as it allows you to adjust the amount of heat that is being applied.

These do work quite well, however you do need to use the correct source of heat. A good or reasonable quality heat gun with a deflector works well, it will get the solder to melt and makes a good solid connection that will test with no major increase in the circuit resistance. I tried a mini-torch with heat deflector in my pre-use testing, its just too is too hot, too fast. By time the solder melts it over heats the shrink tube which then fails. If your looking for a system to same time, this may or may not be the best choice, it is a bit faster than soldering and covering with shrink tube. But you will need to take your time to get a good connection you cant rush the heat. If you have some electronics flux available adding a very small amount to the wires before you slide the connector over helps with the flow of the solder.

Awesome connectors for any type of wiring work. Waterproof solid connection definitely better than any crimp connectors I’ve ever used. Way faster than solder and shrink tube the old fashioned way lol. Definitely recommend and will be buying again.

Fast. easy. Shink seal. Good quality. I will never go back to butt connectors. Use a heat gun!

I like these solder connectors I did have to go a size larger , I strip about 1/2 inch on both wires slip on connector to 1 wire then twist/ weave wires together then slide connector over twisted wires then use heat gun or torch. Strong and weather proof splice!