1M Heat Resistant Water Cooling Pipe 3*5mm 4x6mm 4*7mm Silicone Water Cooled Tube Water-cooled Silicone Tubes for RC Jet Boat 1M Heat Resistant Water Cooling Pipe 3*5mm 4x6mm 4*7mm Silicone Water Cooled Tube Water-cooled Silicone Tubes for RC Jet Boat. Sale price : $4.22 Category : Toys & Hobbies