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QS -50 Antifreeze prevents marine engine cooling systems and boat, RV and home plumbing systems from bursting in cold weather. This antifreeze is formulated with a premium additive package for maximum corrosion protection. When used correctly, it provides reliable burst protection to -50°F for drinking water systems. The Non-toxic, eco-friendly Propylene Glycol formula is tasteless, and contains No Glycerin. The bright pink color makes spring-time draining virtually foolproof.