Yamaha - Water Tube 1 Cooling System Water Transfer 6EG-44361-10-00. Overview. Water tubes are one of those parts that quietly do their job until something goes wrong. I've seen engines overheat just because a tube was slightly off or corroded where you couldn't easily see it. This is what carries cooling water up from the pump into the powerhead, so it has to be straight and sealed every time. When it's lined up right, the cooling system works exactly like it should.. Key Features. • Direct Cooling Water Transfer - Moves water efficiently from the lower unit to the engine.• Consistent Engine Cooling Support - Helps maintain proper temperature under load.• Durable Tube Construction - Built to handle constant water flow, vibration, and heat.• Precision Alignment Fit - Designed to seat correctly between pump and engine connections.• Exact Yamaha Replacement - Matches factory specifications for reliable installation and performance.. Engine & Boat Compatibility. Designed for Yamaha outboa