Pure RV & Co's Ultra Guard Max RV Antifreeze is designed for RVs, boats, pools, and potable water systems, providing dependable burst protection down to -50°F. Ideal for winterizing before storage, its Propylene Glycol–based formula contains 0% ethylene glycol, remains non-toxic and potable-water safe, and is suited for seasonal freshwater plumbing. Unlike traditional formulas, Ultra Guard Max is non-toxic and suitable for all potable water applications. It also helps lubricate seals, faucets, and valves to maintain system integrity during storage, helping reduce the risk of damage when de-winterizing. Intended for RV and marine freshwater systems and seasonal plumbing—not for use as automotive engine coolant. Versatile, reliable, and made in the USA, Ultra Guard Max is built for RV and marine owners who want proven protection through every season.