Yamaha - Water Tube Cooling System Component 6L2-44361-00-00. Overview. The water tube is one of those parts you don't think about until cooling problems show up. It's responsible for carrying water from the pump up into the powerhead, so if it's bent, clogged, or not sealing right, the whole system suffers. I've seen engines overheat simply because this tube wasn't seated properly after a service. Keeping it in good shape ensures steady water flow and reliable cooling every time you're on the water.. Key Features. Direct Water Flow Path - Transfers cooling water from the lower unit to the engine block.. Precision Fit Design - Ensures proper alignment between water pump and powerhead.. Durable Construction - Built to withstand constant water exposure and engine vibration.. Factory-Spec Fitment - Designed to match Yamaha cooling systems for proper sealing and operation.. Supports Cooling Efficiency - Helps maintain consistent engine temperature during operation.. Engine & Boat Compatibi