The Donaldson P539477 is a genuine radialseal safety air filter element designed for optimal protection of engine air intake systems in various heavy machinery. This high-efficiency cellulose filter ensures clean air, extending engine life and maintaining performance. It serves as a crucial secondary filtration stage, complementing the primary air filter. Compatible with numerous Caterpillar, JCB, Komatsu, and Volvo models, it provides reliable filtration with an outer diameter of 108.7 mm, an inner diameter of 81.3 mm, and a length of 209.6 mm.