Quicksilver 818573 Cylinder Head O-Ring

The Quicksilver 818573 is a genuine OEM replacement O-ring designed for Mercury Marine and MerCruiser marine engines. This precision-engineered seal is manufactured to Mercury Marine's strict quality standards to ensure reliable performance and proper fitment.

Key Features:

• Genuine Mercury Marine OEM part - not aftermarket
• Engineered specifically for cylinder head sealing applications
• Manufactured from durable, marine-grade materials resistant to fuel, oil, and temperature extremes
• Precision molded for exact fit and reliable sealing
• Helps prevent leaks and maintain proper engine compression

This O-ring is designed for use on select Mercury and MerCruiser outboard and sterndrive engines. For proper fitment verification, consult your engine's service manual or reference your engine serial number with the Mercury Marine parts catalog. Sold individually.

Note: OEM part number may also be referenced as 25-818573.