Adapter with GFCI. Now you can plug in your power drill, sander or any other 15 amp tool or appliance into that 30 amp outlet on the dock. Features manual reset button, high impact PVC housing - UV stabilized, sealed GFCI housing and keypad, and large LED power "on" light. Meets watertight requirements. Female (Boat) 15A Straight Blade Male (Dock) 30A, 125V Twist Lock Color Yellow