Sierra 118-2712 Stern Drive Adapter Plate Gasket

The Sierra 18-2712 is a precision-engineered adapter plate gasket designed specifically for Mercury/Mariner 15-25 HP 2-cylinder outboard engines. This gasket provides a critical seal between the adapter plate and engine components, preventing oil and coolant leaks while maintaining proper compression.

Manufactured with marine-grade materials, this gasket is built to withstand the harsh conditions of saltwater and freshwater marine environments. Sierra marine engine parts are designed to meet or exceed OEM specifications and are backed by a comprehensive warranty for reliable performance.

Key Features:

• Direct replacement for Mercury OEM part numbers 27-414181, 27-41418, and 27-85979
• Constructed from durable marine-grade materials for long-lasting performance
• Precision-cut to ensure proper fitment and sealing
• Designed specifically for Mercury/Mariner 15-25 HP 2-cylinder outboard engines
• Meets or exceeds original equipment manufacturer standards

This adapter plate gasket is an essential component during routine maintenance, engine rebuilds, or when replacing the adapter plate assembly. Proper gasket replacement helps prevent costly engine damage caused by oil or coolant leaks and ensures optimal engine performance.