Donaldson Blue air filters protect engines and help them last longer by providing better initial & overall efficiency compared to conventional celulose. • Genuine PowerCore filters provide superior protection and performance. • Proven Ultra-Web® media provides superior protection over traditional cellulose filters. • Proven Radial Seal™ offer 50% more sealing area and two times more gasket compression for a sure-fit seal. • Rugged construction holds up in heavy-duty work environments.