A-222422A1-AI Filter, Inner AirOne New Aftermarket Replacement Inner Air Filter Fits Caterpillar, Fits Case IH, Komatsu, McCormick, Fits John Deere, and Fits New Holland Equipment This secondary (inner safety) air filter element installs inside the primary outer air filter to provide a second stage of air filtration, protecting the engine from fine dust and debris that may pass through the outer element. It is commonly used across a wide range of construction, agricultural, and