1 piece compact version adapter for 6-30P plug into 14-30 240V outlet. Molded with electroplated copper terminal in order to avoid surface oxidation effectively. Dryer 30 AMP 4 prong NEMA 14-30 250V male 4-prong plug. Industrial device 3-prong 6-30 female receptacle. Used 10AWG conductor inner wire, support max 30 AMP loading. Heavy-duty 100% copper wire conductor inside.