Amazon.com: CircleCord 4 Prong 100 Feet 30 Amp Generator Extension Cord and Inlet Box with Locking Connector, Heavy Duty NEMA L14-30P/L14-30R, 125/250V 7500W 10 Gauge SJTW Generator to House Power Cord :
parkworld 100 ft. 10/4 NEMA L14-30 Generator Extension Cord (NEMA L14-30P to L14-30R with Lighted) UL Listed 62305A - The Home Depot