Don’t leave your intake open and exposed!! This is a cover plate to block off 4150 /4160 square bore carburetor flanges on intake manifolds and seals the intake tract to keep parts, debris, etc. from entering your engine. Great to protect new engine builds before they are ready to run or block off an engine’s intake during carburetor/throttle body service. Made from a high-strength, renewable plastic with a precise fit that fully covers the carburetor flange. *does not include mounting hardware *material is not designed for heavy solvents or caustic solutions, saturation with these materials is not recommended