Introducing the Donaldson safety air filter, a reliable guardian for your engine's well-being. This filter serves as a failsafe in case of primary filter damage or improper installation, ensuring uninterrupted operation. It acts as a formidable barrier, preventing contaminants from infiltrating the clean side of the air intake system during primary filter servicing. Engineered with precision, it's designed to swiftly plug if any contamination manages to breach the primary filter, alerting operators promptly. To maintain optimal performance, we recommend replacing safety filters with every third primary filter change, unless a primary filter failure occurs. Compliant with ISO 5011 standards, you can trust in its quality and dependability. With a length of 8.26 inches, inside diameter of 1.91 inches, and outside diameter of 2.44 inches, this filter is meticulously crafted to safeguard your engine.