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

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.

My god these things are the best invention mankind has ever come up with. Seriously whoever invented these should have a statue made of them and put in every town in the country.If you do any kind of tinkering or electronic repair, or just like to mess with stuff you NEED these in your life. I’ve been a tinkerer all my life, I like nothing more than fixing and messing with electronics and have been soldering for about 30 years but these are a game changer. Just strip the ends of the wires and push each end into the correct size tube and heat with whatever you use, I use a gas powered Dremmel portable soldering iron. The solder strip in the middle melts and solders the wire and the 2 seal rings shrink and seal the wires from water. The joint is amazingly strong when done right and is very neat.These are great to use in tight places when you don’t have much room like when your working on a vehicle.I absolutely love these and will always have them in my tool kit from now on.

Excellent product ideal for joining electrical wires.

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...

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.