The Donaldson Primary Round Air Filter is a high-quality air filter designed to provide superior filtration for heavy duty engine applications. With its axial seal filter type and round shape, this air filter is specifically designed to fit Thermo King air cleaners. Made from strong and pliable gasket material, this air filter creates a tight seal against the air cleaner housing, ensuring that only clean air is delivered to your engine. The filter media material is made from high-efficiency cellulose, which performs exceptionally well across a wide range of heavy duty engine applications. This air filter is also corrosion-resistant, ensuring that it will last for a long time even in harsh environments. Additionally, the pleatloc feature ensures uniform pleat spacing and prevents media from bunching, promoting longer service life. Overall, it's an excellent choice for anyone looking for a high-quality air filter that will provide superior filtration and long-lasting performance. FleetPride is your First Click in Heavy Duty®.