Conntek 14405 RV/Marine Pigtail Adapter Standard US 15 Amp w/Locking Screw to 30 Amp Locking w/LED Indicator Plug (Male): NEMA 5-15P, 15-amp, 125-volt Receptacle (Female): NEMA L5-30R, 30-Amps, 125-Volts, Locking Style Maximum Wattage: 1,875 Watts Safely Converts standard US outlet to a 30-Amp locking inlet Unique plug screw enables a secured connection