Heater Hot Tube - Heatercraft OnlyA HeaterCraft Hot Tube is a flexible, extendable heating duct that allows warm air from a HeaterCraft marine heater to be directed exactly where it's needed. It's a popular add on for wakeboard and ski boats, providing instant warmth to riders and passengers. Key Features of the Hot Tube: Retractable Design: The tube pulls out for use and retracts when not needed, keeping the boat tidy. Directable Warm Air: Can be aimed at hands, feet, or even inside