Briggs & Stratton, foam air filter element, fits on 475 & 500 series b&s engines with a range of 148 cc - 158 cc, also fits previous classic, sprint & quattro series engines with plastic air cleaner housings & a range of 3.5 hp- 4.5 hp, for use on brands such as craftsman, mt, poulan, snapper & many others equipped with the listed engines, diy version of Briggs service part# 698369.