1-piece AC Power Adapter L14-30P to L14-20R 125V/2500W. Generator 30 AMP 4-prong locking male plug, Generator 20 AMP 4-prong locking female connector. Molded with electroplate copper terminal in order to avoid surface oxidation effectively. Heavy-duty round power adapter plug for generator 100% copper conductor inside. Test electrical function by UL & cUL standard. Yellow adapter with lighted inside.