new sun rv 7 way blade to 4 way flat trailer adapter waterproof 7 pin to 4 pin trailer wiring adapter with dust cover new sun <b>this trailer light adapter is designed to convert 7-way plug with rv blade type terminals to standard 4-wire flat, it includes a dust cover to help protect terminals and help prevent corrosion, and provides a simple plug-in and is equipped with an easy pull grip design for quick and easy disengagement.</b><br>