The Jarvis Marine Deluxe 2 Way Flusher offers boaties a more thorough flush for motors. It has a dual flow design that allows the system to be flushed out from both intakes. It’s easy: just slip it over the water intake holes, plug in the hose, turn on the tap and start the motor. Motor Flushers are used to flush out the cooling system of your motor and can also be used to test-run your motor before heading for the water. You should always flush your engine with freshwater after use to get rid of salt and other impurities.