Yamaha - Lower Case Packing Lower Unit Sealing 6E0-45315-A0-00. Overview. Anytime you're working on a lower unit, sealing it back up properly is everything. This packing sits right where the lower case needs to stay watertight, and if it's worn or reused, you're asking for trouble. I've seen clean gear oil turn milky fast just from a bad seal in this area. Replacing it is a simple step that helps protect everything inside the lower unit from water intrusion.. Key Features. Watertight Seal Performance - Helps keep water out of the lower unit to protect internal components.. Compression-Ready Material - Designed to seal properly under torque without breaking down.. Maintains Gearcase Integrity - Supports proper lubrication by preventing contamination.. OEM Fitment Design - Matches original specifications for correct placement and reliable sealing.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines with standard lower unit gearcases. Commonly used on smaller horse