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100% USP Propylene glycol acts as a lubricant to prolong pump life, while at the same time acting as an antifreeze agent. Depend on Ultra Flow glycol to deliver dependable performance. Other brands of glycol only use a percentage of propylene glycol, or sometimes even a chemical derivative. Such brands do not have the lubricating properties because of the additives, and in most cases contain products that are corrosive to the graphite seals in pumps.