The 4-1/8 in. OD Kubota Tractor Air Filter protects heavy-duty equipment by preventing airborne dirt and other contaminants from entering the combustion chamber. The radial seal tractor air filters utilize a urethane compound to form the molded ends and bond the media pack, which includes the inner and outer metal wrappers, forming a strong, yet flexible package. The heavy-duty radial seal gasket formed from this urethane compound is designed to make servicing your tractor filter easier and more cost effective.