The Donaldson Primary Round Air Filter is a top-of-the-line air filter designed to provide superior performance and protection for your heavy duty engine. With its radial seal filter type, this air filter ensures a tight and secure fit, preventing any harmful contaminants from entering your engine. Measuring at a length of 492.13 mm and a round shape, this air filter is specifically designed to fit Freightliner trucks. Its high efficiency cellulose media is capable of performing across a wide range of heavy duty engine applications, ensuring that your engine is protected from harmful particles and debris. In addition, this air filter is corrosion resistant, ensuring that it can withstand harsh environments and last longer than other air filters. The Pleatloc feature ensures uniform pleat spacing, which maximizes the filter's surface area and improves its overall efficiency. Overall, the primary round air filter, for Freightliner is a reliable and high-quality air filter that will keep your engine running smoothly and efficiently. FleetPride is your First Click in Heavy Duty®.