Combustion engines use carburetors to manage the amount of air and fuel entering the chamber. However, to start some combustion engines, a choke is required. This part regulates the air pressure within the intake manifold. This effectively adjustes the air and fuel levels entering the engine, and allows more fuel to reach the inside to ensure that it starts easily. The choke valve is then opened as the machine runs. The choke is installed through a grommet that ensures a good seal, but the grommet can wear out over time. This replacement choke grommet is designed for an array of small engine machines, including pruners, trimmers, saws, and edgers made by Little Wonder and Echo. This OEM replacement part is sold individually and is made of long lasting rubber. It does not include any other components in the assembly.