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BikeMaster Muffler Plugs are designed to seal off the muffler to protect the exhaust system from water during pressure washing. These muffler plugs are specially formulated to be stiff enough not to fall out but soft enough to be inserted into the pipe without causing damage. BikeMaster Muffler Plugs are available in a small size that fits most 2-stroke applications and a large size for 4-stroke applications.