Nilight RV Generator Adapter Cord 30 Amp to 50 Amp 4 Prong Pure Copper Heavy Duty Twist Lock Male Plug 6/3+8/1 Gauge Wire L14-30P to 14-50R 30M/50F for RV Camper Caravan Van
AC WORKS NEMA 30 Amp 125/250-Volt 4-Prong Locking Male Plug With UL C-UL Approval ASL1430P-BK - The Home Depot
NEMA L14-30P to 4 Port 5-15R 5-20R L14-30R 5 Outlet 120/240V 30 Amp 4 Prong Twist Lock Male Plug to Female Receptacle Home Appliance RV Generator Power Cord Adapter - Amazon.com
AC WORKS 1.5ft NEMA 14-50P to NEMA L14-30R 30-Amp 4-wire Single To Single Orange Basic Flexible Adapter in the Adapters & Splitters department at Lowes.com