691593 Power Adapter 20AMP 4-Prong Generator Locking L14-20P Male to RV 30AMP TT-30R Female

Recreational Vehicle Adapter L14-20P to TT-30R 125V/3750W 

Generator 4-prong 20A L14-20 locking male plug 

RV 3-prong 30A TT-30 female receptacle 

Connect a generator with 20 AMP L14-20 locking plug to an RV with a standard 30 AMP RV cord set