The Case-IH AF4139 is a genuine primary engine air filter designed for heavy-duty agricultural machinery, including various Case-IH combines, tractors, cotton pickers, and forage harvesters. This filter effectively removes contaminants from the air intake, protecting the engine from wear and extending its lifespan. With an outer diameter of 263.65 mm, an inner diameter of 150.37 mm, and a length of 444.5 mm, it provides a precise fit and reliable filtration for demanding operating conditions.