Slide the tubing over the cable before you connect the wires to the splice block. Then slide the tubing over the connector and shrink it with a heat gun (best) or a torch (gently). The other type ...

Twist-on wire nuts are a traditional, inexpensive choice that work for most splicing applications ... to combine under a single wire nut. Push-in connectors are similar to lever nuts but do ...

That’s particularly problematic for things like wire splices in damp environments, something that no amount of electrical tape is going to help. Heat shrink tubing might be your friend here ...

Wire Connecting Solution, a wire splicing system designed to streamline and standardize wire connections in aviation and ...