Prestone RV Antifreeze is designed to winterize potable & seasonal water systems; RVs, Pools, Boats and seasonal homes. It is safe for use in all potable and seasonal water lines. It protects systems down to -100 F, extreme cold weather, with a No Burst Guarantee. Prestone waterline antifreeze's superior protection against damage, corrosion and rust, is safe for metals and plastics found in most potable water systems. Use Prestone's waterline antifreeze if you want to be confident that you have your possessions protected from cold.