haisstronica200PCS Blue Heat Shrink Butt Connectors-Copper Core 0.8mm,16-14 Gauge -Waterproof Wire Connectors-Insulated Electrical Connectors,Crimp Connectors for Watercraft,Electrical,Electronics

These are so good and priced so good too! They last a while, will save you a lot of money over the years, buying a few at a time at your local store AND they're higher quality too boot. Just use a heat gun to seal up the connection. My second time buying these blues. Still have a lot of the yellows left. Buying before I run out. I never want to be without these on hand now.

These worked great and used a lighter to shrink them.

Good wire joints. The heat shrink does not have glue in it, so I rate them as water- resistant. Used for trailer wiring, 12 volt.

I use this to install an extra fan to cool hard working Honda ATV engines in the Gold Mining Industry.

Work vary welll and seal is great when heated