E-4420Washable and reusableDesigned for industrial and small engine applicationsOutstanding filtration protects the engineEase of maintenanceOne year limited warrantyThe K&N E-4420 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-4420 is easy to install and is custom designed to fit some Onan generators and Clark Equipment forklifts, as well as other applications.