Kuject270PCS Solder Seal Wire Connectors, Self-Solder Heat Shrink Butt Connector Waterproof Insulated Electrical Butt Splice Wire Terminals for Marine Automotive Boat Truck Stereo Wire Joint

After using crimp-style butt connectors for many years, I decided to give these a try. I am impressed! They are incredibly easy to use, and worked perfectly the first time. I have a small heat gun that I bought for use with surface mount devices on circuit boards, and it really does the job with these connectors. You just slide a connector over one of the wires, strip the ends of the two wires to be joined, bend the stripped ends into hooks and twist them together, slide the connector over the joint and apply heat. The solder quickly melted, and the tubing shrank down over the wires while the sealer also melted, sealing the joint. Quick, easy and permanent. Highly recommended!

Super easy to use and make a fantastic connection. When I first purchased I did a test connection with a spare piece of wire. I could not pull the connected wires apart after connecting them. Heat shrink appeared to completely seal the connection as well. Great addition to the electrical parts I keep on my sailboat.

A little background: I've been doing electrical and electronics for over 40 years and was an aviation electronics tech in the US Navy so I've worked on everything from simple car/truck/trailer wiring, residential/commercial electrical, and electrical/electronics on military aircraft so I've dealt with wires as small as 24awg all the way up to 500 MCM (wires about 1" across) which means I've done a fair bit of splicing in my life. Now with that said nothing will replace a straight un-spliced wire but that's in a perfect world. Your sooner or later going to have to repair a wire or connect prewired devices to existing wiring. A solder joint is one of the best ways to do this and adding heat shrink to protect and insulate the splice has been the best method and next being a mechanical splice which is the next best thing. I found out about these via a YouTube video and of course looked on Amazon for them, I found so many different sellers and the reviews ranged from 1 Star to 5 Stars so I thought I would order some and give them a try. Glad I did because they work great and plan to buy more. From what I can see after using them and seeing the complaint reviews is a couple of things.#1 DO NOT USE A LIGHTER OR TORCH! Use a heat gun if you can. Remember these are basically made of plastic with some low temp solder inside. If you use a lighter or torch then you have to be very careful about how close to the splice you are and how long you concentrate that heat in one spot. I understand not everyone has a heat gun and if fixing wiring in a place you don't have an electrical outlet to plug one in will happen.#2 Make sure you have clean wire! By this I mean when you strip out the end of the wire it should be nice shiny copper, not corroded (copper turns green when corroded and in worse case black) and the reason is that the solder band inside the heat shrink does have some flux content to it but not enough to etch away that corrosion to allow a good flow of wire between the stands on the two wires your splicing.Tips: Make sure you strip out the end of the wire long enough for them to overlap one another and stay in the area of the solder sleeve. Make sure the copper is nice and clean (shiny). Applying heat to one end first to help hold one of the wires in place while you hold the other end in place with your hand. Keep your heat source (heat gun preferred) a good distance away from the splice, if it's not shrinking then move it a little closer until it starts to shrink or melt the solder band, if you see the heat shrink sleeve start to darken or burn your too close! Make sure your rotating the splice as your shrinking and soldering it, a common mistake when using this product or just heat shrink alone is that the person just holds it in once place and holds the heat source in one spot expecting it to heat the entire thing and shrink. If you see the insulation on the wire start to melt or bubble again you have the heat source too close to the wire or your concentrating that heat in one spot too long. In the picture I attach you can see the smallest splice that they have used to splice two wires (18-20 awg copper stranded, I don't remember) and the splice is still translucent and the solder flowed great (note the right side wire, the insulation is a little bubbled and thats my fault with the heat in one spot too long and also with that small of a gauge of wire it can heat up really quick).Over all being a little skeptical of the product based on the reviews I got it anyways and I'm glad I did! I planed on only using these on splices where they needed to be water proof but after using them and seeing how well they work I will use them for every splice from now on. Hope this helps others in making their decision on weather or not to buy and try these splices.

Excellent wire harness repair. All in one saves time. What I like most about these is the spar they save. As a master automotive technician I find I’m repairing harnesses and getting rid of that bulk is the best feature. These are durable and work great when directions are followed. Only thing is the solder on some of the larger ones sometimes take a little long to melt.

These are incredible. I have used these now for multiple applications, from a car to sprinkler wires to vending machines. Just carry a heat gun and short extension cord for most places and you're set. You do strip the wires farther than you usually would with a crimp. The only thing I will say somewhat as a warning is that they work way better with stranded wire than solid wire. I have had a couple instances where solid wire pokes a hole in the coupler and I have to start over. Other than that, these are easy to use, guarantee a solid connection, go waterproof, and make it so that the connection isn't a massive piece of plastic that you will be able to see even under shrinkwrap. If you cover the wire with shrinkwrap afterwards, you won't even notice that there is a splice in the wire

Installed a new aftermarket radio in an older car. These made making the hybrid wire harness easy to assemble and the result was a neat waterproof but connection to the numerous connections I had to make. Work like a charm, as advertised.

I hadn’t used these types of solder + shrink tubing before, they worked much better than expected and were simple to use.I used a heat gun on high setting and was able to make a really secure connection.

I can't compare these to other brands, but seem to take a bit of time to melt the solder. The colored rings that grip the cable jacket work very well.

Low heat to melt solder. Waterproof and easy to use. Plenty of different sizes in this kit.Good product.

They worked perfectly for the wiring I had to do on my Can Am Spyder.

Ich musste ein Paar Kabelbrüche reparieren und bin somit auf diese Lösung gelandet. Alles hat prima funktioniert!!Der Rückspiegel funktioniert wieder einwandfrei, die Kabel sind zusammengeschweisst und wasserdicht!Ich kann dieses Produkt jedem weiterempfehlen. Vorallem sind seeehr viele Teile dabei für einen fairen Preiis.Unbedingt beachten!!!!!!!Mit einen Heissluftföhn arbeiten, kein Feuerzeug.

What an amazing invention. Soldering wires can be tricky, especially in hard to reach places. And then remembering to add insulation before joining the wires. This solves so many challenges in one hit. No solder, no flux, not insulation required, just insert your freshly trimmed wires in each end, heat with a heat gun and voila, its done. I have used all sorts of temporary and bulky connectors to avoid a soldering iron, but this quick and easy permanent solution is the best in my opinion.

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