Outfit your semi truck to be Ready for the Road Ahead™ with a safe way to vent engine gases, with the Fleetguard CV52001 Premium Crankcase Ventilation Spin-On Breather. Thanks to its straightforward design, this replacement device is able to filter harmful gases produced in an engine before releasing them into the atmosphere. Crafted with premium materials to be resistant to both heat and oil. FleetPride is your First Click in Heavy Duty®.