The ConnectPro system features locking plug and receptacle and spring clamping connection to provide a secure electrical contact. Features watertight sealing cap and corrosion-resistant, plated brass electrical components with drain holes in receptacle. Standard 1-1/8" diameter mounting hole accepts up to 8-gauge wire. Comes with mounting plate. Plug has O-ring seal for waterproof connections and weather-resistant plug cover. Accepts 16 to 8-gauge wire.