ConnectPro 3-Wire Plug. Features:. O-ring seal for waterproof connections. Weather resistant plug cover. Corrosion resistant, plated brass electrical components. Accepts 16 to 8 gauge wire. Ergonomic contoured grip for easy hook-up and ground blade alignment. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.