The ConnectPro system features locking plug and receptacle and spring clamping connection to provide a secure electrical contact.. Receptacle is universal design for 2-or-3 wire configuration, 12, 24, 12/24, 24/36 or 36 volt systems. Features watertight sealing cap and corrosion resistant, plated brass electrical components with drain holes in receptacle. Standard 1-1/8" dia. mounting hole and 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.