What is the rubber tube coming from your 60 HP Mercury Outboard lower unit?

The rubber tube coming from the lower unit of a 60 HP Mercury outboard is typically the water intake or telltale hose. It allows water to be drawn into the engine for cooling and also serves as a discharge point to indicate that the cooling system is functioning properly. If water is not flowing from this tube, it may signal a blockage or malfunction in the cooling system, which requires immediate attention to prevent engine overheating.