-100°F Engine & Water System Antifreeze

West Marine Pure Oceans -100° (-73°C) Marine Antifreeze provides the ultimate in extreme cold weather and corrosion protection for drinking water systems and all engines. Its premium additive package prevents corrosion of aluminum, copper, brass and solder, but will not harm rubber, seals or hose materials. The 3X-died blue-green color provides excellent blow-through visibility. Formulated with non-toxic, virgin Propylene Glycol (60% Blend), it is tasteless and contains no alcohol. This product is ready-to-use or may be diluted – please follow label directions for dilution ratios.

• Provides burst protection to -100°F (-73°C) and freeze
  protection within a range of -58°F to -63°F (-50°C to - 52°C)
• When testing with a refractometer or hydro- meter designed for use with propylene glycol, freeze point readings on the PG scale will range from -58°F to -63°F