This step-by-step how-to-video will walk you through the process of flushing your MerCruiser 4.5L or 6.2L sterndrive engine. By flushing the internal water passages of your engine with fresh water after each use in salt, polluted, or muddy water, you will help prevent a buildup of deposits from clogging the internal water passages. For additional information, please consult your Mercury owner's manual.