Sopoby120PCS Solder Seal Wire Connectors - Heat Shrink Solder Connectors - Waterproof Solder Butt Connector Kit Insulated Automotive Marine Electrical Wire Terminals

You can buy it with peace of mind of very good quality. Seller ships fast thanks seller

I bought these because I do a lot of guitar electronics, and I was just getting tired of soldering wires together, then applying shrink tubing. These things are great; but you have to know a few things.First, don't expect that the solder inside will melt as quickly as you see in the ads. It melts, but it takes a while. Remember to heat all around the diameter of the connector, not just one side, for a more even distribution of solder, and better shrinking of the tube.Second, make sure that the ends of your wires are both long enough to reach to the center of the connector. just slide the two ends past each other, then apply heat. Not only does the solder melt to solder the two wires together, but the body of the connector acts like shrink tubing, and the two rings at either end of the connector shrink to help hold the wires in place.Third: heat. It is tempting to use either a butane lighter or soldering iron tip to melt the solder and shrink the tubing, but don't do it. The connector will start to melt (soldering iron) or turn black (butane lighter) The soldering iron can also melt a hole in the connector, which kinda defeats your purpose. A good heat gun is quick, easy, and leaves the connectors looking pristine and perfect. (The heat gun I use is about $20 on Amazon.) A note, though: give time for the finished connector to cool down--like a minute or two--before you test the connection by pulling on it. Also, use the smallest connector that will fit the wires you're using. Using a larger connector may seem easier, but the smallest connector you can use will make perfect connections.I've used so many of these that I'm going to have to order more--only this time, I'm going to get the BIG box...

If you follow the directions these work very well. I stripped the wires. Used a wire brush to make sure the wires were clean. Made a hook on each end to make a strong physical connection. Then using a heat gun, rotated it around the connector until the solder flowed. Making a stong waterproof soldered connection. Can not ask for more. I used these to redo a fuel injector harness for a 95 F-150. Ohmed out the harness before wrapping up and was good to go. These should last for years. I did use heat shrink over the connection. To shield them from heat generated by the engine. I have used a similar brand before. But these were really good as well. I have recommended these to a friend already. And gave him some. He had excellent results as well.

I was going to give a negative review because the plastic kept melting away before the solder melted, but then I got a better heat-gun with adjustable heat. The sweet-spot seems to be around 400 degrees F where you can melt the solder without burning away the plastic. My old heat gun had a constant temp around 600F and that was just too hot. Take your time, let it warm up slowly to 400F, and all will turn out fine. I find it helps to smear some solder flux in between the wire strands before joining them in connector. This helps to pull the solder in between the strands once the solder finally melts.Con: I really don't know why one end is narrower than the other... makes no sense to me. I end up having to use the next size up, but then the solder ring is way-too big and doesn't melt all the way sometimes. I had to remove one star for that.

They make things a little bit easier, & clean looking.I just now finally got to put them in use, in glad I got them, because I do not own a soldering iron any more, all I needed was a heart gun( or a lighter)

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 !!