1. Boat engine muffs Rectangular water intake muffs that are easy to install, clamp tightly, and provide maximum water flow into both intakes with zero leakage once the engine starts. 2. Motor ear muffs Tools not required for installation or removal. Simply slide the flusher cups onto the boat water intake slots and connect your garden hose to one of the included quick connect fittings to run water in or out of the water or use to winterize the motor. 3. Inboard engine flusher An easy to use inboard engine flusher designed to flush the engine after every trip. 4. Boat motor flusher cleaner Flushes contaminants from the cooling system and allows idling for engine adjustments; installs in seconds. Use scenarios - After every trip to flush the engine cooling system. - Winterize the motor by connecting a garden hose via the quick-connect fittings. - Use the cleaner when engine adjustments require idling with the cooling system flushed.