The Donaldson P781187 is a high-efficiency PowerCore Radialseal primary air filter designed to protect engines in demanding applications. Featuring advanced cellulose media, it provides 99.9% filtration efficiency according to ISO 5011, ensuring optimal engine performance and longevity. This genuine Donaldson air filter is a direct replacement for various Caterpillar and Volvo models, including Caterpillar 325D, 329D, 330D, 336D, 345D, 349D, 365C, 374D, 390D, and Volvo equipment.