The Ultra-Cool Transmission Oil Coolers By Hayden Automotive features ultrasonically soldered for reliability and pressure tested for top quality assurance. High efficiency turbulators in every tube for maximum heat dissipation. The push-on fitting for quick and easy installation. The Ultra-Cool Transmission Oil Cooler is available in four different sizes to fit a wide range of vehicle applications from sub-compacts to motorhomes. Features: Ultrasonically Soldered For Reliability 100% Pressure Tested At 150 PSI For Quality Assurance High Efficiency Turbulators In Every Tube For Maximum Heat Dissipation 3/8"" Push-On Fitting For Quick And Easy Installation PART # THICKNESS HEIGHT LENGTH CORE FITTING SIZE APPLICATION PRICE HAD401 3/4"" 5"" 12-1/2"" 8-3/4"" 3/8"" Push-On Sub-Compact To Compact Cars $38.95 HAD403 3/4"" 7-1/2"" 12-1/2"" 8-3/4"" 3/8"" Push-On Up To Full-Size Vehicles Towing Up To 2500 lbs. $38.95 HAD404 3/4"" 7-1/2"" 15-7/8"" 12-1/8"" 3/8"" Push-On Up To Class ""C"" Motorhomes Towing Up To 5000 lbs. $49.95 HAD405 3/4"" 10"" 15-7/8"" 12-1/8"" 3/8"" Push-On Up To Class ""A"" Motorhomes Towing Up To 10000 lbs. $59.95