Product Details: Ensure your semi truck is Ready for the Road Ahead™ with a safe way to vent engine gases, with the Fleetguard CV50634 Premium Crankcase Ventilation. To prevent a buildup of unwanted pressure, this replacement device filters harmful gases before releasing them into the atmosphere. Fashioned with top-tier materials to be resistant to both heat and oil. FleetPride is your First Click in Heavy Duty®.