Sierra 18-3221 Water Tube Gasket for Mercury/Mariner Gen II

The Sierra 18-3221 is a high-quality replacement water tube gasket designed for Mercury and Mariner Generation II outboard motors. This essential cooling system component creates a reliable seal between the water tube and engine block, preventing coolant leaks and ensuring proper water circulation through the powerhead.

Key Features:

• Precision-manufactured to OEM specifications for exact fit
• Durable construction withstands high temperatures and marine environments
• Prevents water leaks and maintains proper engine cooling
• Direct replacement for Mercury/Mariner OEM gaskets
• Sierra Marine quality backed by extensive testing

Regular inspection and replacement of water tube gaskets during routine maintenance helps prevent overheating issues and extends engine life. This gasket is a critical component for maintaining the integrity of your outboard's cooling system.