4/4 SOOW, 4 AWG 4 Conductor Portable Power Cable 600 Volt - Custom Cable Connection
parkworld 25 ft. 10/4 STW 30 Amp 4-prong Dryer Heavy-Duty NEMA 14-30 Extension Cord 886078 - The Home Depot
AC WORKS 100ft NEMA L14-30 Cord 100-ft 10 / 4-Prong Indoor/Outdoor Soow Heavy Duty Locking Extension Cord in the Extension Cords department at Lowes.com
Extension Cord - 4 Prong (25 Foot) – Houseables
VEVOR 25 ft. 50 Amp RV Extension Cord 4 Wire Gauge RV Wire Diameter Extension Cord RV Cord Power Supply Cable HJLJQ25FT50A6HX01V1 - The Home Depot