Receptacle duplex features compact, impact-resistant nylon face and body are ultrasonically welded together for unrivaled strength. Face colour coding by voltage facilitates locating and mating of proper devices. One piece, high-grade brass contacts offer excellent conductivity and heat-rise resistance. Clearly marked NEMA configuration, rating and third-party listing on each unit s face. Single-piece, solid brass mounting strap is free of easily loosened rivets found on other brands. Side and external screw-pressure-plate back wire capability.