Haisstronica shop – Heat Shrink Connectors
Couldn't be easier to use: just strip the ends of the two wires, insert into the appropriate sleeve (by wire size), but the ends up against each other, and intertwine the stands of the wires, set your heat gun to the highest setting, and pass the gun over and around the solder donut in the middle of the sleeve, and the heat shrink on the ends.
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