Unsurpassed in airflow, dirt stopping and overall performance Two-stage air filters come apart for maximum airflow and ultimate cleaning Most filters feature the Ultra Seal grease groove on the sealing surface Each fits in stock air box exactly like OEM filter Clean easily with grease-cutting dishwashing detergent; just clean, oil and reuse indefinitely Made in the U.S.A. This item fits the following applications: 1981-1982 Kawasaki KDX175 1981 Kawasaki KX125 1981 Kawasaki KDX420 1981 Kawasaki KDX250 1981 Kawasaki KX420