10-30P Plug to 14-30R Receptacle: - MECMO dryer converter plug adapter 4 to 3 prong new dryer to old house, is a great solution for dryer with new style 4 prong dryer plug to 3 prong old dryer wall outlet; Max Power: 30 Amp, 125V/250V, 7500 Watts NEMA 10-30P Male Plug: - NEMA 3 prong 10-30P plug 250V 30 Amp molded male plug, is an older style outlet that is commonly used for clothes dryers and found in homes built before 1996 NEMA 14-30R Female: - New style 4 prong 14-30R socket 125V/250V 30 Amp molded connector for newer electric dryer plug; 10-30P to 14-30R with external ground wire dryer plug adapter adapted old style plug to new outlet Adapter for Older Apartments/Houses: - This 4 prong to 3 prong dryer plug adapter with green ground wire, is a great solution for 4 prong corded new dryer but a 3 prong socket house; NO MORE rewire the house socket or hire an electrician Safety Ground Wire: - Light and ultra compact size for a direct plug and play; Additional green grounding wire, which MUST be connected to the grounding hole of a 15 or 20 Amp household wall socket, outlet, power strip, or extension cord to protect the dryer from overload A must have dryer adapter if you have a 4 prong corded dryer but a 3 prong socket house, Plug the 3 prong plug into the wall outlet and plug your dryer cord into its 4 prong outlet