Amazon.com: PLIS 10-50P to 10-30R Heavy Duty Generator Adapter,50 Amp Dryer Male Plug to 30 Amp Adapter,STW 10AWG*3C Generator Cord,3Prong,Orange,1.5FT : Patio, Lawn & Garden
parkworld 1.5 ft. 10/3 3-Wire Generator 30 Amp 125/250-Volt 4-Prong Locking L14-30P to Dryer 3-Prong 10-30R Adapter Cord 886139 - The Home Depot
L6-30R 3-Prong Female Twist Lock Generator Receptacle Outlet To 14-30P Male 4-Pin Dryer Plug NEMA Power Cord Adapter/Converter. - Amazon.com
10-30P 3-Pin Male Dryer Plug To L14-30R 4-Prong Female Twist Lock Generator Receptacle NEMA Power Cord Adapter - Amazon.com
AC WORKS 1.5ft NEMA 14-30P to Four NEMA 5-20R with Breakers 30-Amp 4-wire To 3-wire Grounding Single To Four Orange Basic Flexible Adapter in the Adapters & Splitters department at Lowes.com