The Donaldson AF1801 is a high-quality primary air filter designed to provide excellent protection for heavy-duty engines and machinery. With an outer diameter of 265 mm, an inner diameter of 146 mm, and a length of 504 mm, this filter effectively captures contaminants, preventing wear and extending engine life. It is a direct replacement for various OEM and aftermarket part numbers, including Caterpillar 3I0006, John Deere AT17591, Komatsu 6001815100, Baldwin PA1801, Fleetguard AF490, and Wix 42680, making it a versatile choice for maintenance.