Maxpower 334342 Replacement Air Filter for Briggs and Stratton 394018S/394018/392642 Fits Briggs & Stratton models: 290400, 290700, 294400, 294700, 303400, 303700, 350400, 350700, 400400, 401400, 402400, 404400, 422400 For use on twin horizontal and vertical C-twin OHV Vanguard engines Replaces B&S #394018, 394018S, 392642 and pre-filter 271271 Also Includes Pre-Filter 272490S