25FT Heavy Duty Generator Locking Power Cord NEMA L14-30P/L14-30R,4X10 Gauge SJTW Cable, 125/250V 30Amp 7500 Watts Yellow Generator Lock Extension Cord with UL Listed YodotekUL CERTIFICATE HEAVY DUTY GENERECTOR EXTENSION CORD Cords with UL file number E257089. 4x10 gauge cable can run the max wattage of 7500 watts,power of 30 Amp 125 250 volts TWIST LOCKING DESIGN The plugs was design with the lock structure. When the plug is inserted and twisted to lock place,it will not slipping from the generator socket due to wind, hurricane,big rain, snow, This is the best extension cord for your generator to connect with home