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

These worked pretty well. I didn't see a suggested temperature to use on these, but I think my heat gun runs a little too hot for these. My gun jumps from 120 to 840. I overcooked a couple of areas, and I was being careful, and I kept the gun in motion. I think something around 400 would work best. The electrical connection seems secure, and electricity is getting through.

Good variety of sizes. Works well with no problems. Easy to use, seals well.

Worked out really well for me. I used them to splice four wires back together. Heated them with a heat gun, and all four worked the first try.

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.

Easy to use and the connection was Waterproof. I am happy with the product.

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.

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...