Hayden Automotive 405 Ultra-Cool Tube and Fin Transmission Cooler Size is 3/4 inch x 10 inch x 15-7/8 inch Class "A" motor homes, large travel trailers, 5th wheel trailers GVWR up to 26,000 pounds, towing up to 10,000 pounds Ultrasonically soldered for durability 100 percentage pressure tested