Briggs & Stratton NON GENUINE Air Filter ST1025230 (Genuine part number 691643)
FITS MODELS:
176400, 19B400, 19E400, 226400, 256400, 19F400, 19G700, 192400 and 196400
3 1/2'' (88.9mm) W x 7'' (177.8mm) L x 1 1/2'' (38.1mm) HT 
Uses 100-234 pre filter