CO2 Antifreeze Laser Coolant Non-Conductive Liquid for Laser Engraver Water ChillerFeatures CO2 LASER COOLANT: OMTech's 1. 1 gallon CO2 laser antifreeze coolant protects your laser tube from freezing or bursting, withstanding temperatures down to 31F, it quickly removes excess heat to keep your engravers functional ALL AROUND PROTECTION: This safe and clean ethylene glycol based coolant and heat transfer fluid with corrosion inhibitors resists freezing, overheating, and erosion to provide long lasting laser life span and efficient