The Cat 5290121 Element As-O is a genuine Caterpillar Standard Efficiency Spin-on Oil Filter designed to effectively remove contaminants from engine, transmission, and hydraulic oil systems. Featuring a durable cellulose media, this filter ensures optimal performance and protection for a wide range of Caterpillar machinery. With a thread size of M20X1.5-6H, it provides reliable filtration to maintain system cleanliness and extend component life in models such as Articulated Trucks (725, 730), Excavators (336, 340), Wheel Loaders (950M, 966M), and Track-Type Tractors (D6, D8).