Conntek NEMA 14-50 50 Amp RV / Generator Extension Cord
Amazon.com: Camco PowerGrip 25-Foot 50-Amp Camper/RV Extension Cord | Features a 50-Amp Standard Male Connector & a 50-Amp Locking Female Connector | Rated for 125/250 Volts/12500 Watts (55542) : Automotive