30A,/50A, 125/250V, Black, 3 Pole, 4 Wire Grounding, Heavy Duty Dual Power Range/Dryer Angle Plug, NEMA 14-30/14-50, UL, Federal Specification, CSA, Interchangeable Blades Allowing Either A 30A, Or 50A, Configuration, UL Listed For Use With Aluminum Wire, Dead Front Design, Box.