Hi-Performance Engine Oil Cooler 

Hi-Performance Engine Oil Cooler, 3" Diameter, 16" Overall Length, 3/4" NPT Oil Connections, 1" NPT Water Connection

Designed for engines making 450 to 750 horsepower.  These units have seventy-six 1/4" seamless tubes - over double that of a 2" cooler.  The cooler incorporates cast end caps, NO cheap press-formed caps are used.  Operating pressure up to 150 PSI.  This is the cooler all others try to imitate but can never duplicate.  Compare features and you will demand Hardin Marine oil coolers.