Star brite 31300 Winter safe -100 DEG F (-73 DEG C) Non-Toxic Antifreeze provides excellent 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. It contains no alcohols. This product is ready-to-use; do not dilute it.