A-B1555728-AI VALVE-THROTTLEOne New Aftermarket Replacement Throttle Valve Fits Briggs and Stratton Engines This aftermarket replacement throttle valve (also called a valve throttle or carburetor throttle slide valve) Fits Briggs and Stratton (B&S) small engines and controls airflow through the carburetor to regulate engine speed and power output. The throttle valve is seated inside the carburetor assembly and opens or closes in response to throttle input, directly affecting