The Donaldson Primary Round Air Filter is a top-of-the-line air filter designed to provide superior performance and protection for heavy duty engines. With its axial seal and round shape, this filter is specifically engineered to fit Caterpillar engines perfectly. Made from high-quality cellulose filter media, this air filter is designed to perform across a wide range of heavy duty engine applications. The cellulose media is highly efficient, ensuring that your engine is protected from harmful contaminants and debris. In addition to its superior filtration capabilities, the air filter is also highly corrosion resistant. This means that it can withstand harsh environments and extreme temperatures, ensuring that it will last for a long time. The Pleatloc feature of this air filter ensures uniform pleat spacing, which helps to maximize the filter's surface area and improve its overall performance. This feature also helps to prevent pleat bunching, which can reduce the filter's effectiveness and lead to premature failure. Overall, the primary round air filter, for Caterpillar is an excellent choice for anyone looking to protect their heavy duty engine from harmful contaminants and debris. With its high-quality cellulose media, corrosion resistance, and Pleatloc feature, this air filter is sure to provide superior performance and protection . FleetPride is your First Click in Heavy Duty®.