Yamaha - Water Seal Rubber Cooling System Component 6L2-44368-00-00. Overview. Seals in the cooling system don't get much attention, but when one goes bad, you'll know it fast. Loss of water pressure or inconsistent cooling can come down to something as simple as this rubber seal. I've seen perfectly good pump setups underperform just because the seal wasn't holding. Replacing it is a small step that keeps the whole cooling system working the way it should.. Key Features. Maintains Cooling System Seal - Helps keep water flow properly contained within the pump system.. Prevents Water Loss - Reduces leaks that can affect cooling performance and pressure.. Flexible Rubber Construction - Designed to maintain sealing under constant movement and pressure.. Factory-Spec Fitment - Matches Yamaha components for proper installation and alignment.. Essential Pump Component - Commonly replaced during water pump service or rebuild.. Engine & Boat Compatibility. Designed for Yamaha outboard engines