Mercury – Quicksilver Water Shutter | Exhaust System Component | Flexible Check Valve | 60930

Overview

Keeping water out of your engine is critical — and that’s exactly what the Mercury Marine 60930 Quicksilver Water Shutter, also known as a water flapper, is designed to do. This flexible valve fits inline in the exhaust system of MerCruiser sterndrive installations, closing when the engine is off to stop water from backflowing through the exhaust and into the cylinders. When the engine is running, it opens easily to let exhaust gases exit freely. It’s a simple part with an important job — protecting your engine from corrosion and serious water damage.

Key Features

• Purpose: Prevents backflow of water into the engine through the exhaust system.
• Design: Acts as a flexible one-way check valve, opening for exhaust flow and closing to block water when the engine stops.
• Material: Made from heat- and corrosion-resistant composite for durability in marine conditions.
• Performance: Protects the engine from water intrusion that can cause rust or internal damage.
• Placement: Installed downstream of the flexible union between the elbow and Y-pipe inside the exhaust system.
• Ease of Use: Direct-fit OEM part that installs easily with standard tools.

Engine & Boat Compatibility

• Numerous MerCruiser sterndrive installations
• Fits inline inside the exhaust system, downstream of the flexible exhaust union

Performance & Real-World Benefits

The 60930 water shutter provides a reliable barrier between your exhaust system and engine. When the engine shuts off, it automatically closes to keep water from flowing backward into the cylinders — preventing corrosion, hydro-lock, or costly internal damage.

When running, it flexes open to allow exhaust gases to exit smoothly without restriction. It’s a quiet, low-maintenance part that helps protect one of your engine’s most vulnerable points. Replacing worn or missing shutters ensures your engine stays dry, even when idling in rough water or backing down.

Why Choose Mercury OEM

The Quicksilver 60930 is a genuine Mercury Marine part, designed for exact fit and reliable function in MerCruiser exhaust systems. Aftermarket shutters often use stiffer or lower-quality materials that can fail to seal properly, letting water seep back toward the engine.

Mercury’s OEM shutters are built with marine-grade composites and tested for flexibility, heat tolerance, and long-term sealing performance. Choosing OEM ensures your exhaust stays watertight and your engine stays protected.

FAQ

Q1: What does a water shutter do?
It closes when the engine is off to prevent water from entering the exhaust and reaching the engine.

Q2: Where does it install?
It installs inline in the exhaust system, downstream of the flexible joint between the elbow and Y-pipe.

Q3: What’s it made from?
A flexible, heat-resistant composite material designed to withstand marine heat and vibration.

Q4: Why replace it?
Over time, the flapper can stiffen, tear, or fail to seal properly, allowing water intrusion.

Q5: Why OEM over aftermarket?
Mercury OEM shutters fit perfectly, seal reliably, and are made from materials tested for long-term marine durability.