7-way 7 Pin Round Trailer Connector Male and Female RV Plug Blade Socket Adapter for sale online | eBay
What is a 7-pole plug? - TRALERT®
Amazon.com: 15ft, 7-Way ISO Yellow Electrical Coil Assembly, 12" LEAD 12' Working Cable, (4/12, 2/10, 1/8 GA), 2 Plugs, ISO 3731 w/inverted grnd pin, Made in USA : Automotive