Reduces Coolant Temperatures A Must For Cooling System A unique wetting agent for cooling systems, Water Wetter reduces coolant temperatures by as much as 20 degrees Fahrenheit. It can be added to new or used antifreeze to improve the heat transfer in your cooling system. Water Wetter also reduces scale buildup in cylinder heads for better cooling and keeps water pump seal lubricated for longer life. It also provides excellent corrosion protection for modern cast iron, aluminum, and brass cooling systems. 12 oz