HOPKINS TOWING SOLUTIONS, 7-Way Blade, 4-Way Flat/6-Way Pin, Trailer Adapter - 440A99|47565 - Grainger
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MaxxHaul 7-Way Round to 4-Way Flat Trailer Plug Adaptor with 18 in. Flexible Cable Extends to 36 in. 70086
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4 Way Flat to 7 Way Round Blade Trailer Adapter Plug End 4 pin to 7 pin Electrical Connector with Mounting Bracket for RV Truck Car - Newegg.com
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7-Way Round Pin to 4-Way Flat Connector Adapter - Adapters - Wiring, Adapters, Connectors - Products
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