Hayden Automotive 679 Rapid-Cool Plate and Fin Transmission Cooler Size is 3/4 inch x 11 inch x 11-5/8 inch Class "A" motor homes, large travel trailers, 5th wheel trailers GVWR up to 30,000 pounds, towing up to 10,000 pounds Patented internal turbulation increases heat transfer with minimal pressure drop Pre-drilled mounting brackets for easy installation