Amazon.com: YETOR 16 AWG Way Car Waterproof Electrical Connector,4 pin Plug Auto Electrical Wire Connectors Marine for Car, Truck, Boat, and Other Wire Connections.(5 Pack)¡ : Automotive
4 Pin Mini-Din Kycon Snap and Lock DC Power Connector
Waterproof Four 4 Pin Wire Panel Dash Mount Connector 12V Plug Socket 15A Boat | eBay
Fender Rhodes 4-Pin Connector Male Straight with Lock – Vintage Vibe
Reese Insta-Plug Kit 4 Wire Flat in the Trailer Parts & Accessories department at Lowes.com