AC WORKS NEMA 14-50P to NEMA 10-30R 30-Amp 4-wire To 3-wire Grounding Single To Single Orange Basic Elbow Adapter in the Adapters & Splitters department at Lowes.com
Husky 50 ft. 14/3 High-Visibility Medium-Duty Indoor/Outdoor Extension Cord HD#582-789 - The Home Depot