Sierra 18-0721 Dry Joint Exhaust Manifold Gasket Square Port

The Sierra 18-0721 is a dry joint exhaust manifold gasket designed for marine applications on 2002 and newer GM V-6 and V-8 engines. This single-piece, open-style gasket features a square port configuration and is engineered specifically for dry joint exhaust manifold and riser systems.

Key Features:

• Square port design for proper exhaust flow alignment
• Open-style single gasket construction
• Compatible with dry joint manifold and riser configurations
• Manufactured to OEM specifications for reliable sealing
• Replaces worn or damaged exhaust manifold gaskets

Engine Compatibility:

• GM 4.3L V-6 engines
• GM 5.0L V-8 engines
• GM 5.7L V-8 engines
• GM 6.2L V-8 engines
• Fits MerCruiser stern drive engines with dry joint exhaust systems (2002+)

This gasket provides a critical seal between the exhaust manifold and riser, preventing exhaust leaks and water intrusion. Regular inspection and replacement of exhaust gaskets is essential for maintaining engine performance and preventing corrosion damage in marine environments.