AC WORKS 1.5 ft. L14-30P Generator 4-Prong 30 Amp Plug to (4) NEMA 5-15/20R 20 Amp Household Female Connectors Adapter Cord L1430F520-018 - The Home Depot
VEVOR 30 Amp Generator Cord 4 Wire 10-Gauge 40-ft / 4 3-Prong Outdoor Sjtw Heavy Duty General Extension Cord in the Generator Accessories department at Lowes.com