Hayden Automotive 404 Ultra-Cool Tube and Fin Transmission Cooler Size is 3/4 inch x 7-1/2 inch x 15-7/8 inch Pick-up trucks and vans, class "C" motor homes , travel trailers to 24 feet GVWR up to 22,000 pounds, towing up to 5,000 pounds Ultrasonically soldered for durability 100 percentage pressure tested