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

I've never used this type of wire connector before, but I connected wires with four of them without any issues. they work as expected. I also bought this heat gun, B0CHVDL25P, because of another review suggesting using a reflector, which I didnt have. My only negative opinion of them is wishing they had more solder or some type of indicator when the joint is secure because I was unable to see the solder melt and just guessed when it was complete.

The best way to solder wires together! Ultra cool invention. Saves a lot of time.

I’ve used these Sopoby solder seal connectors across multiple projects—vehicle mods, electronics tweaks, even a few reptile habitat upgrades—and they’ve held up well. The dual-wall design with hot melt adhesive inside gives a strong seal, and the solder ring melts cleanly with a heat gun (skip the lighter unless you like uneven results). Color-coded sleeves make it easy to match wire gauges (AWG 26–10), and the included case keeps everything organized. Once shrunk, the connection is tight, waterproof, and surprisingly durable—even in outdoor or high-humidity setups. Just make sure to heat evenly and rotate the connector for a proper seal. If you want fast, reliable wire joins without crimping tools or messy soldering, this kit delivers. Not fancy, but functional—and that’s what counts.

They work decently just be careful not to overheat with lighter or will melt before solder even melts which has happened a few times which can be annoying.

These little connectors are great! It says to use a heat gun but you can use a lighter at a distance just don’t hold it in one spot go back and forth it works fine

These things work so good! And very sturdy connection! All you need it a small torch. A lighter will work but torch is better

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.

ok. not what I expected. solder does not work well/ and wires do not hold in place

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.

A great secure way to connect the wires just heat up the solder and securely does the job no mess

Good idea but these are let down by the lack of solder in the middle. Solder content needs to be 3-5 times more as when heated the amount of solder just isn’t enough to run into the connection properly

Re wired an classic car all the way to installation of switches on modern cars these little connectors are just superior to the butt crimp. Fast and easy to use altought some connector seems to have less solder., Cold weather of tight space this thing is just above and beyond better than soldering.