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This round cup motor engine flusher offers a comprehensive series of motor flusher that extend your motor life quickly, easily, and effectively. It flushes contaminates from lower unit cooling system and it quickly removes salt and mineral build-up with a simple flush that slips over side water inlets on most inboard and outboard lower units. Install in seconds using just a garden hose, and no tools required. Flush the motor every time your boat to help keep salt, grime, gilt, and sludge off the internal parts your motor. Made of durable PVC. High quality motor flusher. Increase the life of all outboard engines. Cups rotate for easy application. Soft, rubber cups for proper circulation, and also pretends scratching. Flush away sand, salt, mud, and alkali from your engine. Tune your engine and make minor adjustments when out of the water. No tools required. Item# PM153303