Shop Nilight 7 Way Trailer Plug Extension Cord 8 Feet Heavy Duty 7 Pin Wiring Harness Cable 10-14 AWG Double-Prong Copper Terminals Wires for 7-Blade RV Trailer Tow Wiring Connector-8FT in high quality, support 2 Years Warranty. Simply plug this extension cable into your existing 7-way trailer plug and instantly extend its reach by 8 feet. It’s a convenient solution for all your trailer extension needs.