The Briggs & Stratton 698181 is a genuine OEM 90-degree in-line fuel shut-off valve. It is designed for small engines using a gravity-feed fuel system, allowing you to manually stop the flow of gasoline from the tank to the carburetor. Genuine OEM Replacement The Briggs & Stratton Fuel Shut-Off Valve 698181 is the factory-original part. It is specifically designed to handle ethanol-blended fuels (greater than 10%) without degrading. This 90-degree valve is a popular choice for its 1/4-turn operation, making it easy to use even in tight engine compartments.