NEMA 14-50R Outdoor Electrical Receptacle Outdoor dustproof and Weatherproof for RV, Electric car,Four-Slot Single Female Receptacles. Choose from our selection of NEMA 14-50 receptacles in a wide range of styles and sizes. In stock and ready to ship.UL Listed. Black. Choose from our selection of NEMA 14-50 plugs in a wide range of styles and sizes. In stock and ready to ship.