Shipcool Coolant Pre-Diluted is a ready-to-use, water-based engine coolant for both light-duty and heavy-duty marine engines. It contains corrosion inhibitors that protect engine components like copper, brass, steel, cast iron, and aluminum. This coolant is nitrite, amine, and phosphate-free (NAP) and is suitable for gasoline and diesel engines in marine, on-road, off-road, farm, mining, and construction equipment. It also provides excellent wet sleeve liner cavitation protection without using nitrites. Designed for mixed fleet applications, this coolant does not require dilution with water.