50pcs Solder Seal Wire Connector, Sopoby Solder Seal Heat Shrink Butt Connectors Terminals Electrical Waterproof Insulated Marine Automotive Copper(23Red 12Blue 10White 5Yellow)

Great quality and nice variety of sizes. I bought these to have them on hand for when I need them which when you are living and travelling full time in a 5th wheel is pretty much anytime something stops working it seems everything is somehow tied to electrical in one of these and because it's like a earthquake in the trailer every time you move it things break and come loose fairly often. I've used several of these already and love having them onboard because every time I've used one the outcome has been perfect the melt exactly like they should using my 1500 watt hot air gun all you have to do is strip and short piece of each wire end your using first insert one wire end into the splice and melt the splice onto the wire, insert the other wire end into the open end of the splice and again melt the splice with a hot air gun or other heat source the metal center of the splice will complete the circuit making the wire whole again that's it it's not hard at all. I've had great success with these in the trailer and in my pickup I use to tow the 5th wheel I don't see running out of these anytime soon but when and if I do I will be buying more just like these from this seller.

I read a bunch of the reviews and took a chance that this lived up to the hype and it really does. It was super easy to join all the wires in the cable harness that I was working with. I was easily able to push the one wire through and then the other from the other side, have them mingle in the center and then hold it over my upright heat gun and just watch the heat shrink tubing and then the solder seal up the joint. It was beautiful and made a strong and water tight seal (not that water tight was really anything I needed to worry about), just like a regular soldered joint and heat shrink, but without a two step process. The only thing I needed to be careful of is that the whole thing is still a bit gooey when you take it away from the heat gun, so letting it cool a few seconds before applying any accidental lateral pressure kept from making a mess. Connected about 30 pairs of wires in about 30 minutes without having my hand hurting from crimping connectors over and over again. Love this, would totally order it again, and as some others mentioned, the box was surprising small and compact. Really great, highly recommend, but you definitely want to have a heat gun.

As an Engineer I found this to be a great idea so I tested it out on a piece of wire which I stripped and twisted together. I slid one of the red shrink sleeves over the joint then used a lighter, and after a few seconds of moving the flame back and forth, the solder seemed to melt and it looked to be a good connection. Then I tried pulling it apart and the connection failed. I then tried again, but this time I dipped the stripped ends of the wire in Flux which is a very necessary part of the soldering process. Not only did the joint work perfectly after using the flux, it also heated up much faster, reducing the chance of melting the plastic. Without the flux you can get what is called a "cold" joint where the solder melts but doesn't really flow onto the wire. I don't know if the average person has flux laying around but it would be great if they included a small tube in the kit. Or better yet, figure out a way to line the inner part of the shrink tube on either side of the solder, so it gets applied to the wire when things heat up. Great idea and works in a pinch when you don't have electricity for a soldering iron - just needs flux!

I like these connectors so far. It takes just the right type of procedure to get them to work. What I have done is to strip (proper size wire) the wires about 1/12 inch and insert the wires from both ends until the wires touch the insulation on each other leaving them bare wires exactly in the middle. Twisting for me did 2 things I didn't like. In most instances, it made making close connections very hard to do, and the other thing is that twisting the wires also most time made the wires bundled that way a bit too large to safely and easily pull the connector over them. letting the wires either naturally slide past each other or into each other made for the best results. The next thing that is required is to get a good quality heat gun and hold it about1.5 to 2 inches ways and heat while moving it back and forth. Heat from at least 2 different angles and the solder will melt properly, the sealer will spread out and the casing will shrink properly and provide a hold that is very difficult to pull apart. I used probably close to 50 lbs. of force and could not pull wires apart. Let the connections cool a bit before moving them around. If you have more force than 50lbs on your wires you need to do something to relieve that stress. These are not for every type of connection or for every place a connection is needed, but given the proper space and type of wire, these work far more effectively than I expected them to.

A must have

Nice assortment, they are water proof

The whole concept is good but the problem I have with these is that the heat shrink melts easily and I can't ever get the solder to melt before the heat shrink starts burning away.

When paired with a decent heat gun, my poor little soldering iron cries on the work bench as I tackle the odd splice without it. These really work well, the kit has a decent selection of sizes and just a few seconds under som heat and they shrink up tight (there is waterproofing feature, but have not verified) with the soldered connection great. Just slide one on, push your slightly frayed ends together and twist just enough to keep them from pulling apart, and slide it over and heat well. Let it cool in place, as it take a minute to cool down, or you may end up with a bend or poor connection. Nice product, great for hobbies and around the house wiring fixes.

Good product but grossly overpriced

El precio no corresponde

Aun con pistola de calor al maximo la soldadura no se derritió. Solo el plastico se encogió, nada mas.

Would buy again

I've always shied away from using but connectors and other crimp on style connectors except for temporary usage. I have always soldered and shrink tubed my connections and have never had an issue. I heard so much hype about these connecters that I finally gave them a try. To my surprise, they are just as good as soldering and shrink tubing the connections but with fewer steps. A real time saver and a good solid connection protected from the elements.