RV Power Cord 25 foot 30 amp to 50 amp Adapter with Marinco Connector SS2-50R 25 foot 30 amp TT-30P male to 50 amp SS2-50R female adapter three 10-gauge 100% copper wires works with all 50 amp twist lock power inlets plugs into 30 amp TT-30 outlets UL, CSA approved