Hercules, Gallon, Cryo-Tek -100 Anti-Freeze, 70% Virgin Propylene Glycol With Triple Protection Inhibitor Package, Premixed With Water, In A Ready To Use Formulation, Undiluted, Provides Freeze Protection To -60°ree. Fahrenheit, Minimum Flow to -70°ree. Fahrenheit, & Burst Protection To -100°ree. Fahrenheit.