Yamaha - Water Tube 1 Cooling System Water Transfer 6EG-44361-00-00. Overview. Water tubes are one of those parts you don't notice until cooling problems show up. I've worked on Yamahas where a slightly bent or misaligned tube caused overheating that didn't make sense at first. This piece carries water from the pump up into the engine, so it has to be straight and sealed every time. When it's right, the cooling system just works quietly in the background like it should.. Key Features. • Direct Cooling Water Transfer - Moves water efficiently from the lower unit to the powerhead.• Consistent Temperature Support - Helps maintain proper engine cooling 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 o