Anti-freeze and summer coolant is a concentrated formulation for extended life coolant in heavy duty as well as light duty applications, found in on-road off-road, marine, farm, mining, and construction equipment. The concentrate contains organic additive technology corrosion inhibitors to provide extra protection to cylinder liners found in heavy-duty applications. Features Anti-Boil Anti-Corrosion What's in the box 2x 1L Anti-freeze