A clean air filter is critical to keeping a Briggs and Stratton engine running. Air Filters for Briggs & Stratton engines used on 8-13.5 HP Power Built, Vanguard™ OHV V-Twin engines, & AVS™ engines. Fits most 12.5-20 Gross HP vertical crankshaft L-Head twin cylinder Original Briggs air filters in stock, you can trust ProParts Direct for easy ordering and fast shipping.