Oregon 30-044 Air Filter Replacement for Briggs & Stratton 393957, 393957S, 390930, 24519 Fits 7 thru 18 HP Horizontal Engines 170400, 190400, 195400, 233400, 243400, 300400, 320400, 325400, 326400 Series Use Oregon 30-920 Foam Pre-Cleaner 4-1/4" OD, 2" ID, 3-13/16" Height Replaces Briggs # 393957, 393957S, 390930 and Ariens 24519