Protect engines and water systems against freeze damage during winter layup.Virgin propylene glycol offered in three strengths to protect your engine and freshwater system against burst damage. While just as effective as traditional ethylene glycol antifreeze, propylene glycol is nontoxic and nonpoisonous. This antifreeze also inhibits fouling and helps lubricate pumps and valves throughout engine and potable water systems without harming drinking water by leaving a toxic residue. Because removal of all water from engine systems is nearly impossible, we recommend you use this product full strength for maximum protection.Key FeaturesNontoxic, virgin (not recycled) propylene glycolOffered in four strengths for freeze/burst protection up to -200F.Does not contain corrosive soluble salts commonly found in recycled antifreezeConcentrated, nontoxicDark blue color for blow-through visibilityMade using 100% virgin propylene glycol