Product Details: Outfit your semi truck to be Ready for the Road Ahead™ with improved crankcase ventilation, with the Fleetguard CV52055 Crankcase Depression Regulator (CDR) Valve. With a specialized design that regulates pressure between an engine crankcase and turbocharger valve, this replacement component is the ideal solution to expel gases from a crankcase. Constructed with a straightforward body for fast and easy installation. FleetPride is your First Click in Heavy Duty®.