Hopkins Towing Solutions 48145 4 Wire Flat Extension, 12 Voltage and 12in Length Features:Extend your current 4 flat connector by 12 inches with this Hopkins Towing Solutions 4 Wire Flat Extension. Many tow vehicle connectors are mounted in the bumper of the vehicle. The extension provides extra connector length on the trailer wiring to plug in and provide enough slack for sufficient trailer turning radius. The terminals of the 4 wire flat extension are resistant to corrosion for long-lasting use. The printed wire functions on the extension allows for easy wire reference. Extension lengthens the wiring system of a trailer for more flexibility Length of 4 wire flat extension: 12 in. Most commonly used trailer connector Found on small boat/utility vehicles Corrosion resistant terminals on the extension provide long-lasting use Printed wire functions on the extension for easy wire reference Meets SAE standards