ECS Premier 20 Amp - 50 ft Generator extension cord (L14-20) (15254)
AC WORKS 50ft Super-Duty 5-15P to 5-20R Cord 50-ft 10 / 3-Prong Indoor/Outdoor Soow Super Heavy Duty General Extension Cord in the Extension Cords department at Lowes.com
AC WORKS Heavy Duty Durable Extension Cord (50FT NEMA 5-20 20A 125V) - Amazon.com
Yellow Jacket 2991 125V 20 Amp 2500W 50 ft. 10/3 SJTW Heavy-Duty Extension Cord with Lighted T-Blade Plug - Walmart.com
Yellow Jacket 2991 10/3 By 50 Foot T Blade Extension Cord: Outdoor Extensions & Powerblocks 35 to 50 Foot (078693029912-1)
Southwire 50 ft. 12/3 STW 20-Amp Power Distribution Outdoor Heavy-Duty Twist-Lock Generator Extension Cord 90288802 - The Home Depot
12/3 Gauge, 50 ft SJTW POWERBLOCK w/Lighted End Extension Cord. Contra
Heavy-duty NEMA 14-50 extension cord for EV, with folding handles, 20 ft.