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

So, I actually ordered these by accident, but after I realized my mistake, I figured I would give them a try. I thought I bought crimp and seal connectors like I always use, but these are a low temp solder that melts with a standard heat gun. I used them last night on a replacement headlight connector in a Silverado and they worked like a charm. Cut the old connector off, installed the solder connection and the new pigtail, mate wires and slide the connector and hit it with a heat gun until the solder melts. EASY. I had my doubts at first because I figured the connector would melt before the solder made a real connection, but they worked like a charm. The connector shrunk nicely around the wire and the colored sealant melted into place and spread out and shortly after, the solder flowed into the wires. pretty slick to be honest. the joint set up and seems to be watertight and a solid connection. good value and I'll be using these more often for sure. They seem to be well made and look like the connection will hold up.

The Kuject Heat Shrink Solder Seal Wire Connectors Kit is an essential tool for anyone needing reliable, durable electrical connections! ⚡ This 120-piece set includes waterproof butt connectors that are perfect for automotive, marine, boat, and truck wiring. The heat shrink design ensures a secure, insulated seal, while the soldering feature guarantees a strong, lasting connection. 🔒 Whether you're working on electrical repairs, installations, or custom wiring, these connectors provide a hassle-free, professional-grade solution. The waterproof quality makes them ideal for use in harsh environments, ensuring your connections stay safe and functional even in wet conditions. 🚗🚤 Highly recommend for anyone looking to improve the reliability and longevity of their electrical systems!

I like that the set comes with several different sizes of connectors but all of them work the same way, just with different size wires. They appear to offer secure connections and I tugged on them with sufficient normal usage force to encourage them to fail, but none did. I suppose they all would fail if sufficient force were used but the amount of force I used was not extraordinary. But this was all after the melted solder inside the connectors had time to cool after using the heat gun. The plastic shell of the connectors also melted and shrank tightly around the wires so no noticeable water entered the connections to cause them to short out and not work. I used them to make rudimentary electrolysis setups so I could remove fowling etc. from old coins I was experimenting with. The electrical connections worked really well, even when they fell into the saltwater mix although I did not have both the positive and negative ends in the water at the same time and I was using only 5 watts of electricity. I feel certain that these connectors will work fine in 12-volt electrical automobile connections. I used my heat gun on high setting only and did not use any other type of heat to melt the solder and shrink the plastic.

I picked up the Kuject Solder Seal Heat Shrink Butt Connectors for some wiring projects, and honestly, they’ve made my life way easier. If you’ve ever struggled with messy connections or worrying about durability, these will be your new best friend.The best part? The solder ring inside melts perfectly when heated, creating a strong, clean connection without needing extra tools or messy soldering. Plus, the heat shrink sleeve seals everything tight and waterproof, which gives me confidence that my connections won’t fail even in tough conditions.I tested these on my car’s wiring and some home electronics, and every joint has held up great — no corrosion, no loosening, just solid connections. They’re also super easy to use, even if you’re not a pro.With 200 pieces, I have plenty to keep me stocked for future projects. Overall, I’m really happy with the quality and performance of these connectors — they definitely take the headache out of wiring jobs.

Easy to use, great price. Works really well for joining thin wires and cabling.

Nice, easy to use. Lots of different sizes.

I have only tried 1 piece and they work as designed. Good variety of sizes. I will buy again.

I bought the item worked when I melted it... the plastic made it tight/waterproof, but then the sodering part did not melt and the wires were connected, but then eventually disconnected, so I returned the case as it somewhat worked, but somewhat didn't its not a great item... 1 of the 4 units I used worked...