Briggs & Stratton Air Filter Cartridge/Pre-Cleaner 12.5 - 20 HP 5050K Replaces Briggs & Stratton Service Part #394018S (Air Filter), and #272490S (Pre-Cleaner) For 12.5 through 20 Horsepower Horizontal Crankshaft L-Head Twin and most Vanguard OHV V-Twin Engines Genuine Briggs & Stratton Part