Equip your vehicle to be Ready for the Road Ahead with advanced hydraulic oil filtering and cooling, with the Thermaflow 9.25" Hydraulic Oil Cooler with Hydraulic Fan / Relief Valve. Thanks to its lightweight and versatile design, this replacement cooler is the ideal option for trucks looking to filter oil - while maximizing their load capacity. Crafted with a hydraulic fan motor with a fixed flow control that automatically cycles the fan on when the system is running. FleetPride is your First Click in Heavy Duty .