STIHL AIR FILTER KIT (4238 140 4404)STIHL AIR FILTER KIT (4238 140 4404) FITS TS410, TS420, TS480i, TS500i, 4238, 140, 4404 STIHL recommends using only STIHL Genuine replacement parts for the repair and maintenance of your STIHL equipment. We want every STIHL owner to have the best product performance possible, so if you are in need of STIHL repair or equipment maintenance, Stihl genuine parts are the way to go.