A-B1691827-AI VALVE-EXHAUSTOne New Aftermarket Replacement Exhaust Valve Fits Briggs & Fits Stratton Small Engines This exhaust valve is a direct fit replacement Fits Briggs & Fits Stratton (B&S) small gasoline engines used in lawn and garden equipment including lawn mowers, riding tractors, and other outdoor power equipment. The exhaust valve seats in the cylinder head and controls the release of combustion gases from the engine cylinder, and is a critical wear component