High quality water system and engine protection used by the pros in extreme cold environments. Winterizing your boat for the off season protects your investment and can prevent costly repairs in the spring. Star Brite WinterSafe -100 (-73C) Marine Antifreeze provides the ultimate in cold weather and corrosion protection for drinkingwater systems, sanitation systems and all engines. Ideal for regions with a mild but freezing winter, this non-toxic formula uses pure virgin propylene glycol for effectiveness and quality. Virgin glycol reduces residual smell and tastes so that drinking water systems are not adversely affected by winterization. Corrosion inhibitors have been added to prevent damage to metal engine components and seals. Star Brite WinterSafe is alcohol free to reduce evaporation so that antifreeze maintains same concentration and protection throughout the storage season. The intense pink color lets users know when antifreeze has traveled through water lines, sanitation system lines or engine cooling systems and serves as an indicator when flushing systems in the spring. Star Brite WinterSafe is the professional choice for winterizing potable water systems, sanitation systems and engines. See our winterization headquarters by clicking on How to Winterize Your Boat from the West Advisor tab above. There you will find step by step tutorials on winterizing different systems as well as an abundance of information to help you make informed decisions that will keep your boats systems safe in the off season. Key Features Non-toxic virgin propylene glycol formula Safe for potable water systems and engines Added inhibitors prevent corrosion in engine components and seals including aluminum, brass, copper and solder Ready to use—does not need to be diluted Alcohol free to reduce evaporation and maintain protection of areas of pooled water Ideal for colder regions that experience temperature ranges between -58F to -63F (-50C to -52C)—see our Antifreeze 101 for a complete guide to selecting the right antifreeze for your climate and application. Antifreeze 101