Sierra 118-8331-9 Marine Lower Unit Drain Plug Gasket - 5 Pack

The Sierra 118-8331-9 is a value pack of five marine lower unit drain plug gaskets designed for sterndrive and outboard motor maintenance. These gaskets provide a critical seal for your lower unit drain plug, preventing gear oil leaks and water intrusion that can damage your drive unit.

Key Features:

• Replaces Mercury/Mariner part number 12-8331-9
• Five-pack quantity for multiple oil changes or spare replacements
• Engineered to withstand marine gear oil and harsh saltwater environments
• Essential component for proper lower unit maintenance and winterization
• Direct OEM replacement fitment for reliable sealing

Regular replacement of your drain plug gasket during routine lower unit oil changes helps ensure a proper seal and protects your expensive lower unit from costly damage. Always replace the gasket when servicing your lower unit—reusing old gaskets can lead to leaks and contamination.