Lightronic 10 sets DT 2 Pin Connector Kit 16-20 AWG male and female auto Waterproof Electrical Wire Connector Plug;

The 16-20 AWG DT Series connectors are designed to be environmentally sealed, and waterproof. For the protection of your electrical system from dirt, dust, mud, water, vibration and rough terrain whether you are on the road, off the road, racing or on the water.
Many Original Equipment Manufacturers around the world in motorcycle, trucking, construction, agricultural, recreational and heavy equipment industries, use this series of Deutsch connectors.
These connectors are used to connect Low power LED light bar, when the wattage of the light is below 180W.