DuroMax 50-Amp 25-Foot 6-Gauge 14-50 CS6364 Heavy Duty Home Power Backup Generator Cord in the Generator Accessories department at Lowes.com
SEEUTEK 15 ft. 10/4 50 Amp Generator Extension Cord 4 Prong 125-Volt Indoor/Outdoor Extension Cord L14-50 with Lighted End Black BZ-1401 - The Home Depot
VEVOR RV Power Extension Cord 50 ft. 50 Amp Generator Cord N14-50P to SS2-50R General Purpose Cord Heavy-Duty Twist Lock UL HJLJQYT50X50DSK01V1 - The Home Depot