Reco-Cool HD Expert EXTEND Water Based Pre-Diluted Coolant is a ready-to-use, water-based engine coolant for both light-duty and heavy-duty applications. It contains corrosion inhibitors that protect engine components such as copper, brass, steel, cast iron, and aluminum. This coolant is nitrite, amine, and phosphate-free (NAP) and is suitable for gasoline, diesel, and CNG engines in various sectors, including automotive, marine, mining, agriculture, and construction. It also provides excellent wet sleeve liner cavitation protection without nitrites. Designed for mixed fleet use, this coolant does not require dilution with water.