Prepare your vehicle to be Ready for the Road Ahead with superb oil filtering and cooling, with the Thermaflow 9.25" Hydraulic Oil Cooler w Electric Fan / Relief Valve. With a lightweight and versatile design, this replacement cooler works to filter out contaminants from hydraulic oil, while also simultaneously cooling the fluid. Manufactured with an electric fan motor that engages once oil temperatures exceed 110° F. FleetPride is your First Click in Heavy Duty .