The Fleetguard AF25371 is a high-quality primary air filter designed to provide excellent filtration efficiency for heavy-duty engines. This genuine Fleetguard filter effectively removes harmful contaminants from the air intake, protecting critical engine components from wear and extending engine life. Engineered for durability and optimal airflow, the AF25371 ensures consistent engine performance and fuel efficiency in demanding operating conditions. It is a direct replacement for various OEM part numbers, offering reliable fitment and performance.