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Washable and reusableDesigned for industrial applicationsOutstanding filtration protects the engineEase of maintenanceOne year limited warrantyThe K&N E-4640 replacement air filter is constructed with layers of woven cotton for outstanding filtration and low air restriction to help your engine run more efficiently. This air filter can be washed and reused. The E-4640 is easy to install and is custom designed to fit right into the factory air box of some IMPCO small engines, as well as other applications.