The Camco Dual Flow Motor Flusher helps properly maintain your boats engine by flushing out contaminates. It allows you to run fresh water through your engines cooling system. Simply connect the flusher to a standard garden hose to clear out salt and mineral build-up that could jeopardize your engines ability to operate to its fullest capacity. The flushers dual input design allows enhanced flow through the engine. Great for boat winterization. It is compatible with most outboards and sterndrives.