Yamaha - Water Tube Cooling System 6E0-44361-10-00. Overview. The water tube is one of those simple parts that the whole cooling system depends on. It carries water from the pump up into the engine, and if it's even slightly off-bent, corroded, or not seated right-you'll see cooling issues pretty quickly. I've run into cases where overheating traced back to nothing more than a damaged tube. Keeping this piece straight and sealed makes a big difference in how well the motor holds temperature.. Key Features. Efficient Water Transfer - Delivers consistent cooling water flow from the pump to the powerhead.. Rigid Tube Structure - Maintains proper alignment under vibration and engine movement.. Corrosion-Resistant Build - Designed to handle long-term exposure to fresh and saltwater conditions.. OEM Precision Fit - Matches original specifications for correct routing and secure installation.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines with standard cooling syst