This Tube & Fin transmission cooler features 1/2″ copper tubing expanded into aluminum cooling fins and includes embossed turbulators which serve to agitate fluid for maximum heat transfer. Perfect for medium-sized cars and compact trucks and SUVs’ that see light duty towing, they improve shifting performance and extend the life of the transmission by eliminating heat-related transmission failures. This kit comes with a complete transmission cooler hardware kit to easily install onto vehicles with 5/16″ transmission cooler lines.