PowerFit PF922011 120 to 240-volt 4-Prong 20-Amp RV Male Plug Adapter Twist for 120-volt 30-Amp Female Connector Heavy-duty round power adapter plug 30 Amp RV male plug to 30 Amp female connector Adapts all brands of plugs and generators Made of long lasting PVC and solid brass contacts 3 prong male plug