A-B1797778-AI VALVE-EXHAUSTOne New Aftermarket Replacement Exhaust Valve Fits Briggs and Stratton Small Engines This aftermarket replacement exhaust valve Fits Briggs & Fits Stratton small gasoline engines used in 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, playing a critical role in maintaining proper compression, engine timing, and fuel efficiency.