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 ...

Just when you thought there was nothing new in manual wire splicing connectors, Kyocera has announced something else to replace crimps and solder for joining them. “9179-000 Series IDC Splice ...

Use one connector per splice (green, black and white). Buy connectors with as many ports (or more) as wires you need to splice together. Cut each wire so they're the same length. Strip off a half-inch ...