140PCS Solder Seal Wire Connectors, Electrical Heat Shrink Butt Connectors

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.

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.

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.

I run a small repair shop business and wish they had come much sooner. These are wonderful, time saving, devices. I can't believe how easy and yet functional and effective. Simply insert the wires to be connected and heat gun ( or hairdrier on high) and ther you have a SOLID, STRONG, GOOD SOLDER CONNECTION. And it is water proof. And you do not have to insulate or use that black electric tape. GREAT. NOT expensive either. When you consider, time saved, No black tape, no soldering iron, solder, or flux, and low cost. ( and no burns) I LOVE 'EM! 'Thunk y'all will tooooooo!

*EDIT 5/1/2020* So I'm positive these are the best things in the world. I've finally exhausted the majority of the 50 pack and just gladly ordered the 280 and can say that 20-25 for these things is a great deal for how effective these are. For super permanent or less space-starved fixes I still prefer to sit down and solder/wrap normally (like wiring a car stereo) but for just about anything else, even stuff you might come back to, these are a game-changer. You can hold more heat shrink onto the back of the wires since it takes way less heat through the wire to secure these than actual solder where the wire itself can get pretty hot, especially larger more conductive wires that might start closing the heat shrink down the wire prematurely while securing the joint. This actually saved my butt when my headlight wire got caught leaving work (I get off after dark). I had thrown a few in my backpack "just in case" and it actually came up. These are super convenient and get the job done. They're actually pretty solid, too, and feel relatively trustworthy. I like these better than the hard, plastic crimps that don't shrink down, obv, but I mean these things are definitely more solid, and I feel like I've gotten those things tight. For anything worth anything that needs to be permanent, you want to splice, solder, and heat shrink. But when that isn't an option anytime soon, these are by far the most clutch tool to have in your electrical toolbox.

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.

I wanted to like these. They're a great idea, just shove the wires into the sleeve, heat it, and it will solder, seal and shrink in one step. Mice chewed the temperature sensor wires in my spouse's car, so I tried a couple of these connectors to splice them back together. I cut out the damaged section, stripped the wires, stuck them into an appropriate sized connector, then heated them with an Iso-Tip Micro-Therm butane heat gun. The solder never seemed to melt, even though the heat gun is supposed to reach 1300°F. The wires also rotated sideways so that they crossed one another at an angle, instead of remaining side-by-side. I suppose if I could have held onto both wires to keep them straight while using the heat gun it would have worked better, but my third hand was busy at the time. The splice worked, for a couple weeks. But then the Service Engine Soon light came on, and the engine computer gave an error code indicating the temperature sensor wasn't working. I soldered the wires together the old fashioned way and it works again.

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.

great asortment, price was reasonable and at delivery

This is a very effective connector with easy prep and quick application. A heat/paint stripper gun is a definite necessity. Open flame can be used but it is very difficult to get consistent results. These can be used in almost any application but are a must for any wiring that’s consistently exposed to moisture.