Outfit your semi truck to be Ready for the Road Ahead with strong custom wire connections, with the PrimaTronics 22-18Ga Heat Shrink Butt Connector. With an hourglass shape with two inputs, this replacement device is the ideal option to connect two spliced wires from a variety of components. Built with heat-shrinkable tubing to provide a tight, insulated seal. FleetPride is your First Click in Heavy Duty .