2S1285 Element-Air Secondary Fits Caterpillar ModelsOne New Aftermarket Replacement Secondary Air Filter Element for Caterpillar (Cat) Equipment This secondary engine air filter element serves as the last line of defense against dust, dirt, and contaminants that can damage internal engine components on Caterpillar (Cat) construction and industrial equipment. The secondary element works in tandem with the primary filter element to protect the engine air intake system. Features an axial seal and standard