The Fleetguard® CV52055 Crankcase Pressure Regulator (CDR), which regulates the pressure between the engine crankcase and the turbocharger inlet, and the CDR valve holder are part of the CCV Retrofit Kit. The kit protects the engine and provides the best solution for eliminating emissions - helping to reduce oil consumption by eliminating mist, aerosol fumes and oil dripping in the engine compartment.