Get your semi Ready for the Road Ahead™ with a secure transfer of essential fluids, with the Dorman Heavy Duty Pressurized Coolant Reservoir. This replacement component aids in the chilling of the engine and radiator during vehicle operation, thanks its robust tank that holds pressurized coolant. Engineered with a durable construction and secure cap to prevent fluid leaks. FleetPride is your First Click in Heavy Duty®.