Maxi-Cool's generous 5/8'' aluminum tube and 1-1/2'' wide aluminum fin design features the patented Turbulator for more efficient cooling than all other designs. For maximum cooling during high-load conditions, add the electric fan module. All Maxi-Cool coolers feature 3/8'' FPT tube ends. Limited lifetime warranty, oil hose, fan control switch and installation components available separately. Maxi-Cool cooler with 3/8'' FPT tube ends.