Amazon.com: 3 pin trailer connector
NAKAO 7 Way 3 Feet Trailer Extension Cord,7 Pin Trailer Extension,Gooseneck Hitch Extender,Plug-N-Play,10-14AWG,7 Prong Trailer Tow Wiring Connector for RV Trailer,Caravan,Weatherproof Anti-Corrosive 4.5 out of 5 stars 17
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