Yamaha Water Tube 6T4-44361-01-00. Overview. The Yamaha Water Tube 6T4-44361-01-00 is a genuine original equipment manufacturer component designed to deliver cooling water efficiently through your engine's cooling system. This essential tube channels water from the lower unit to the powerhead, helping regulate engine temperature and prevent overheating.. Engineered to Yamaha's exact specifications, this water tube ensures a precise fit and dependable performance. It is an ideal replacement for w