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Mercury Marine Quicksilver Water Shutter Road TwinSurf Fin Setup 50" 2026 Watersports Collection TwinSurf Fin Setup 50" Icon motorcycle helmets Acts as a check valve to keep following seas water from washing back through exhaust to engine when engine is not running or at low rpm Sterndrive exhaust water shutter is for use on MerCruiser sterndrives to keep following seas water from washing back into the exhaust system and into the engine when engine is not running or at low rpm
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