This tube and fin transmission cooler features 1/2 inch copper tubing expanded into aluminum cooling fins and include embossed turbulators which serve to agitate fluid for maximum heat transfer. Perfect for today's highly-stressed subcompact cars, 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 inch transmission cooler lines.