50pcs Solder Seal Wire Connectors, Sopoby Automotive Heat Shrink Butt Connectors Electrical Terminals, Red

It took a few minutes to get the hang of these but, after I did, wow. I used them to extend wires on taller handlebars for my Harley. I was pulling hard on them and they all held. I went ahead and used heat shrink over them (the wires are difficult to get to and I wanted to be sure). These are a slim profile after heating and hold very tight. One note on the solder, heat close at the highest setting (used a 1500w heat gun) until you see the solder shine then stop. Very pleased, will be stocking up on all sizes.

Does what they're supposed to do. I set my heat gun to 650F and use the heat shrink deflector nozzle attachment. One minor annoyance is that the heat shrink tends to *stretch* lengthwise as it's heated, pushing the wires apart slightly. Slight learning curve to get the wire push-in spacing right to account for this stretch.Using them to attach power and data connectors on 20AWG wires for multiple strings of ALITOVE WS2811 RGB LED Pixels Lights (https://www.amazon.com/dp/B01AG923EU/ref=twister_B075F76BPV?_encoding=UTF8&psc=1) we'll be using in this season's holiday lighting. These solder seal wire connectors work pretty darn good, once you get used to them

Work GREAT. I use a heat gun and with practice, can develop right amount of heat to do job without damaging heat shrink covering. Would rate a '5' if outer cover were a bit tougher and the "waterproofing" seal at each end flowed more evenly. I do NOT recommend depending on the "waterproof" condition of your connection as the sealant inside the connector does not necessarily have enough quantity to flow evenly around the wire insulation. I used on motorcycle rewiring of light harnesses so do not need true waterproofing. I used good (3M) electrical tape around each connector (or combination of connectors) to further protect from moisture AND to provide a true physical protection -- OUTER PLASTIC IS QUITE THIN and sometimes (multiple) could see and/or feel beginnings of degradation of that outer plastic. Pictures below. Unfortunately, forgot to take pics of 'waterproofing' sealer not flowing effectively.

Wow - thought these would require some getting used to but made two great unions right off the bat and checked the continuity just to be sure - the tips on the previous customer reviews were very helpful so I was able to skip the "Oh, no you never do that's" - found that it is best to only strip the wire to the length of the solder then slide the two ends into each other (was using pre-tinned copper wire) - slide the terminal over the wire until the solder is over the two ends(if you are joining two wire that are in place, be sure and slide the terminal on one of the wires first) - use a slight crimp on the solder to hold the whole thing in place - don't worry that the solder flattens a bit, it will flow back round when it melts - I sealed the heat shrinks first to further hold things together - then melted the solder - used a butane heat gun (available here on Amazon OTC 4470) to do the whole job, using the small reflector that comes with the gun - where have these things been all of my life?

These things work great. I have been soldering for 40 years so it's something I'm totally comfortable with, so that being said, these things are quick to use and do as good or better than traditional solder. Everything you need is built in. Solder, heat shrink and a sealant at the heat shrink ends that makes everything air tight. I use a pen butane torch with these. I haven't tried them with the conventional soldering iron, only the torch, as that's what I read worked well. and it does. Highly recommended.

These things are amazing. I used several hundred on a Christmas lighting project.A few hints I didn't see others mention:o If in a tight place you can hold the wires in place by crimping with needle nose pliers before heating. This works for the red and white ones but the blue lead is too brittle.o If repairing wires in the cold, warm it first or the expanding air gets trapped and pops the tube.Saved a lot of time and results were excellent!

These are especially handy if you've got limited space / wire length to work with. I'm a 3D printing hobbyist, and these allow me to splice or re-terminate connections without re-running a wire through the entire loom.I found the flame of a microtorch (for the small white/clear connectors I ordered) required too fine a hand to get a good result. By the time the solder flowed, the connector was melting and wire strands were popping through. A hot air blower is better.It's tough to tell with even a carefully-melted connector whether there's melt-through of the conductors/solder, but I guess another layer of heat-shrink over top would solve that. It's just an extra step and expense -- but still easier than breaking out the entire soldering kit for a couple quick connections.

Where have these been all my life!? So simple and easy to use. They work perfectly and are such a clean and elegant solution to splicing wires together.Make sure you have the right color/size for the wires you are connecting.A little heat from a torch, being gentle of course and not melting everything, and the shrink wrap shrinks while the solder melts. Strip a very small amount off of the wire. Push both ends together under the solder point. Then heat. As soon as the solder starts to move, take the heat away.The hard part is holding it all together while it is heated and while it cools. That takes at least 3 hands to do.