Discover the Donaldson primary air filter, meticulously engineered to meet the demands of heavy-duty engine applications. Its high-efficiency cellulose media sets a new benchmark, ensuring exceptional filtration performance across a wide spectrum of challenging environments. To bolster longevity, corrosion-resistant steel liners provide robust support to the media, enabling maximum airflow. The innovative Pleatloc feature takes center stage, ensuring uniform pleat spacing and preventing media from bunching. This not only ensures a prolonged service life but also maintains consistent filtration efficiency. With ISO 5011 certification, you can trust that this filter meets the highest industry standards. At 12 inches in length, with an inside diameter of 6.72 inches and an outside diameter of 11.09 inches, it's a precise fit for a variety of applications.