Pigtail connectors are an insulation displacement connector that are filled with a di-electric grease to prevent moisture from getting inside the connector. You do not need to strip the ends of your wires. You simply insert the wires into the connector and squeeze the blue cap down with a pair of pliers. Metal tines inside the pigtail connector will slice through the insulation of your wires creating the connection while the sealant helps protect against corrosion. These electrical connectors allow you to connect up to three wires of different sizes (20 awg to 14 awg) together. Pigtail connectors are rated to maximum of 300 volts and are UL listed and CSA certified.