CURT 56500 - 4-FLAT WIRE HARNESS 20-25 SENTRACURT 4 FLAT CUSTOM WIRING ; 20 25 SENTRA Plugs into vehicle tail light assembly to provide a 4 way flat socket Simple plug and play design eliminates the need for cutting or splicing 4 way flat output connects tail lights, brake lights and turn signals Equipped with tail light converter for vehicle trailer compatibility Constructed with SMT circuitry for better performance and durability Dust cover included to keep connector clean when not in use