Meet the Donaldson safety air filter, a reliable safeguard for your engine. This filter is your trusty backup in case of primary filter damage or incorrect installation. It acts as the last line of defense, preventing contaminants from infiltrating the clean side of your air intake system during primary filter servicing. Engineered with precision, it's designed to quickly signal if contamination breaches the primary filter, providing operators with a timely alert. Compliant with ISO 5011 standards, you can count on its quality and performance. With a length of 9.33 inches, inside diameter of 4.13 inches, and outside diameter of 5.25 inches, it's tailored to fit seamlessly into your system.