Kuject Heat Shrink Solder Seal Wire Connectors Kit 120PCS, Waterproof Butt Connector Heat Shrink Electrical Terminals, Insulated Solderless Wiring Splice Connectors for Marine Automotive Boat Truck

These work great! Connected some wires and they held really well. Melted down and sealed well.

My friend who doesn't solder, showed me these, and we used them to wire in a new radio into his boat. Using a heat gun works alot faster than soldering, and the shink tubing wrap secures the wires firmly.

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.

Me ha sido de mucha utididad, con esto no hay necesidas de soldadura ni cinta aislante

Can’t go wrong

works great

Super easy to use and are very durable! They have held up very well!

Nothing wrong with item but the this method of connecting wires, especially small wire (24-26 gauge) doesn;t seem that secure. There are youtube comparisons with resistance testing etc and it seems wire nuts and crimps is the best. You may need a crimper for 24-26 gauge and get crimps with heat shrink. I might toss these or donate them.