NEMA L14-30P to 6-50R Generator Plug to Welder Adapter, 4 Prong to 3 Prong Generator to Welder Adapter Power Cord 125/250V, 30 Amp, STW 10AWG 1.5FT - Newegg.com
Miady RV Generator Adapter, 3-Prong 30A Male to 30A Female RV Power Plug for Camper Motorhome Trailer/UL Listed - Amazon.com
Power Grip™ Generator Adapter (3-prong for L5-30 Plug) #55333
L14-30P Male 3-Pin Twist Lock Generator Plug To 10-30R 3-Prong Female Dryer Receptacle Outlet Box NEMA Power Cord Adapter/Converter FX374 - Amazon.com
Amazon.com: RV 30 AMP 3-Prong Generator Adapter Converter, Nema L5-30P Male to TT-30R Female 30A/ 30A Generator Adapter, L5-30 AMP 3-Prong Plug to TT-30 30 AMP : Patio, Lawn & Garden