UL & cUL Listed, Heavy-duty for RV, 100% copper conductor inside. SJTW 12/3C stranded wire Extension Cord with Outdoor Jacket, support max 300 Volts and 20 amp loading. Molded with electroplate copper terminal in order to avoid surface oxidation effectively. Generator 3-prongs Twist Lock L6-20 Locking Connector, 240 Voltages. NEMA L6-20P to L6-20R, Max Rate 5000 Watt (20A250V) Universal to all other Brands 3-ping L6 type 20A locking connector, Chose 25 foot, 36 foot, 50 foot for your need.