The Mercury Washer (12-30119) is a precision-engineered part designed to distribute load evenly, reduce wear, and prevent loosening in high-vibration environments. Whether you're performing routine maintenance or replacing a worn washer, this OEM Mercury part ensures a secure and lasting connection.. Key Features & Benefits:. ✔ Durable Construction - High-quality, corrosion-resistant materials to withstand harsh the marine environment.✔ Distributes Load Evenly - Prevents fasteners from loosening over time, ensuring a secure hold.✔ Reduces Friction & Wear - Extend the life of connected components by reducing stress.. Replacing worn or missing washers can help prevent damage, leaks, or mechanical failures, making it an essential part of proper maintenance.