A-B1591752-AI VALVE-EXHAUSTOne New Aftermarket Replacement Exhaust Valve Fits Briggs and Stratton (B&S) Engines This aftermarket replacement exhaust valve Fits Briggs and Stratton (B&S) small gasoline engines commonly used in lawn mowers, riding mowers, and outdoor power equipment. The exhaust valve seats in the cylinder head and controls the release of combustion gases from the engine, playing a key role in maintaining proper engine compression, performance, and fuel