This part is a carburetor gasket. A carburetor mixes fuel and air before delivering it to the engine. The carburetor gasket creates a seal between the carburetor and cylinder that ensures that air is where it's supposed to be.The carburetor gasket may need to be replaced if the seal is broken and it is allowing air in. If there is a slight leak, the operator may notice engine roughness when it's at idle. A larger leak will cause the engine to vibrate, misfire, or hesitate under acceleration. Remember to wear gloves when operating or performing care and maintenance on any outdoor power equipment machines.This part is a genuine MTD part and is an OEM part sourced directly from the manufacturer. It it is sold individually. This carburetor gasket is compatible with engines, lawnmowers, log splitters, and trimmers manufactured by MTD, Yard Machines, Yard-Man, Cub Cadet, Husky, and Troy-Bilt.