Sierra 18-0721 Dry Joint Open Riser Gasket for MerCruiser

The Sierra 18-0721 is a premium dry joint open riser gasket designed for MerCruiser stern drive engines. This full-flow gasket features an open design with two water passages, providing optimal cooling system performance for standard cooling applications.

Key Features:

• Engineered as an exact-fit replacement for OEM gaskets to ensure proper installation
• Open design allows full coolant flow for standard cooling systems
• Specifically designed for dry joint exhaust manifold and riser applications
• Precision-matched exhaust and cooling ports for reliable sealing
• Manufactured to meet or exceed OEM specifications

Replaces OEM Part Numbers: MerCruiser 27-864547A02, 27-864547A1

Maintaining proper gasket seals between the exhaust manifold and riser is critical to prevent catastrophic engine failure in marine environments. This gasket maintains the essential separation between exhaust and cooling channels, ensuring your engine operates safely and efficiently. Sierra has been a trusted name in marine parts for over 50 years, delivering quality components engineered to withstand harsh marine conditions.