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10 Pass 17" Series 7000 Copper/Aluminum Transmission Cooler Kit, Truck/RVThis Tube & Fin transmission cooler features 1/2" copper tubing expanded into aluminum cooling fins and include embossed turbulators which serve to agitate fluid for maximum heat transfer. Perfect for full-size trucks and RV's used often for towing and hauling, they improve shifting performance and extend the life of the transmission by eliminating heat-related transmission failures. 11/32" hose barb inlets and complete hardware kit included.