The StarryTow  7 way round blade to 4 way flat trailer wiring adapter converts a 7 way round pin vehicle connector to a 4 way flat connector. It features an ergonomic molded design allowing for easy connection and a corrosion-resistant housing ;

Converts 7 way round pin vehicle connector to 4 way flat connector

Weather and corrosion-resistant housing 

Ergonomic molded design allows for easy connection

For use with 12 volts