Roadmaster 790 High Power Diode FeaturesUsed To Tie Into The Towed Vehicles Brake Light, Running Light And Turn Signal Wiring, And Connect It To The MotorhomePermit Electrical Current To Flow In Only One Direction - From The Motorhome To The Towed Vehicle's TaillightsPrevents Electrical Feedback And The DamageHeavy-Duty, Powder-Coated Aluminum Heat SinkWeight - 0.08 Our superior logistics, cutting-edge supply chain management and outstanding customer service mean we deliver these premium brands to stores faster and more reliably than anyone else.