Extend your current 4 flat connector by 18 inches with this 4 flat harness extension. Many tow vehicle connectors are mounted in the bumper of the vehicle. Extra connector length is needed on the trailer wiring to plug in and provide enough slack for sufficient trailer turning radius. Hopkins Towing Solutions 4 Flat Trailer Wire Extension 18 inch, 48185 * Extends wiring system for more flexibility * 18 inch length * Most Commonly Used Trailer Connector * Found On Small Boat/Utility * Corrosion Resistant Terminals * Printed wire functions for easy wire reference * Meets SAE standards * 90 Day Warranty From The Date Of Original Purchase * We're here to help. Contact us with questions: Call toll-free M-F central 8am-5pm 800-835-0129