Introducing the Donaldson primary air filter, meticulously engineered to provide exceptional protection for your engine. Crafted with high-quality cellulose media, this filter, proudly bearing the Donaldson brand, ensures reliable filtration. With a substantial length of 18.00 inches, an inside diameter of 6.50 inches, and an outside diameter of 10.87 inches, it seamlessly integrates into your air intake system. This filter serves as a crucial backup in the event of primary filter damage or improper installation, preventing contaminants from entering the clean side during servicing. Additionally, it's designed to plug rapidly if contamination bypasses the primary filter, alerting operators promptly.