Conntek 20591 Extra-Heavy Duty L14-20 Generator Cord Extra Heavy-Duty Generator Extension Power cord Plug: L14-20P (20-ampere 125/250 voltage twist lock plug) Receptacle: L14-20R (20-ampere 125/250 voltage twist lock connector) Max Rating: 5000 Watt, stays flexible in cold weather, heat resistant up to 221-degrees Fahrenheit; 4 wires 10 Gauge Approval: UL, C-UL Listed Limited 1 Year Warranty