Sierra International TC50000 7 Pole RV Style Blade to 5 Pole Flat 18" Marine Extension Harness Sierra TC50000 7-pole rv style blade to 5-pole flat Adapter for tow vehicles; includes 18 inch Before ordering, please verify this is the correct part for your application. For assistance, please call sierra's Tech support at 1-877-663-8396 All sierra parts qualify for and are Covered under sierra's industry leading customer satisfaction Warranty 76