Mercury - Gasket Set - 27-809125A2. The Mercury Gasket Set - 27-809125A2 is a complete OEM solution designed to replace worn or damaged gaskets during engine service or overhaul. Precision-crafted to fit Mercury engines, this set ensures a reliable seal to protect critical components from leaks, pressure loss, and contamination.. Key Features. Complete OEM Gasket Kit - Includes all required gaskets and seals for specified service procedures. Precision Fit - Manufactured to exact Mercury specifications for dependable sealing. Leak Prevention - Ensures oil, fuel, and coolant remain isolated for optimal engine performance. Durable Materials - Built to resist breakdown under heat, vibration, and harsh marine conditions. Supports Engine Longevity - Maintains proper compression and reduces wear caused by contaminants. Compatibility. The Mercury 27-809125A2 Gasket Set is designed to fit specific Mercury outboard engine models. For accurate compatibility, refer to your engine's serial number a