340PCS Solder Seal Wire Connectors-haisstronica Marine Grade Heat Shrink Wire Connectors-Butt Splice Wire Terminals for Marine,Electrical with Corrosion and Weatherproof(5Colors/5Sizes)

Item as described really easy to use, works much better than the crimp on style. I like that the ends self seal. Nice selection of sizes in the kit too.

Incredible product! Exactly what I needed. Outstanding results! After the repair I used another product not associated with this purchase, Super Glue "EZ Fuse" tape for protection from moisture. The connectors are good to go as soon as they cool, I gave the tape 2-hours to seal before filling the reservoir with water.The project was wiring repair for a pump. It's up and running! 5*****

Great product! Easy to use and you get a lot for the price!

I used the 180PCS Solder Seal Wire Connectors for trailer hitch wiring and low-voltage accent lighting, and they worked well for those projects. The connectors seal tightly, making the job much easier than traditional soldering.However, I encountered an issue with high heat. If you apply too much heat, the outer plastic of the connector melts away before the solder inside has a chance to melt and form a good connection. It’s important to be careful with the heat application, as the plastic can burn off before the solder works properly.Overall, they’re effective for many wiring jobs, but just be mindful of the heat when using them.

Lots of variety, melt resistant, looks good, and functions as needed great value for the money

Product is exceptional at connecting 2 wires and shrimp wrapping the ends as it advertises. It is even good at soldering an end onto a wire while it shrinks over the connector end by cutting one side or the shrink wrap back part way. However there are no instructions so you have to guesstimate how long to heat the connector with the heat gun while turning to heat all sides evenly. It isn't that hard since the shrink covering is clear and you can see the solder melt. Not only that but the solder seems to melt when the shrink wrap is finished shrinking so so connection and seal finish around the same time. After completion let it sit and cool a few seconds before moving or pulling the wires to allow perfect connection. The locking clips on the box are the usual cheap quality you get on a typical shrink wrap plastic box that won't last very long so close carefully. The larger quantities of this product appear to also have a better sealing box. I have been a mechanic for nearly 50 years and this is as critical as I could make the review. The main thing is this is clearly a great 5 star product for connecting wires.

So easy to use and work as described!

When I first tried these I used a mini heat gun that puts out 350 degrees F, with a wire deflector and I couldn't seem to get them hot enough for the solder to flow. The tubing shrank and the glue was melting, but the solder wouldn't melt. Using a flame will destroy the heat shrink before it gets hot enough to melt the solder.Then I tried my bigger, fancy heat gun with adjustable, regulated temperature. That made all the difference. I slowly kept dialing it up until I got over 600 degrees F before it stated to melt. At about 700 degrees or so, it seemed to work pretty good without ruining the heat shrink. You can get the hot melt to melt at a lower temp and that may grab the wire well, but not get a soldered joint. I think the key is to take your time to allow the heat to penetrate deep enough to heat both the solder and the wire, without getting the outside so hot that the shrink portion gets overheated.Heat shrinkable crimp sleeves will be faster, but these leave a much nicer slim profile, which is an advantage when splicing multi-conductor cables. These are supposed to be pre-fluxed, but it doesn't seem like much beyond a very light coating. It would be nice if the solder flowed just a bit better and just a tiny dab of rosin flux on the joint, seems to enhance the flow. I also think a twisted joint works just a bit better than just shoving the strands together, as it seems to wick the solder just a bit better.In conclusion, these do work well at making a very good connection that is waterproof. But it takes some time and just the right level of heat, to do them well. A good, adjustable heat gun with a pretty high output, is an advantage,