ComStar Freeze Free -50ºF, Aluminum Safe Boiler Anti-Freeze, Propylene Glycol Formula with Freeze Protection to -50º F Burst, Compatible with Aluminum Components, Made in USA, 5 Gallon (35-729)

The industrial coolant and heat transfer fluid. Protects to -100º f. Protects to -50º f. Safe on aluminum ComStar international Inc. Is the world's most comprehensive manufacturer of environmentally safe, industrial strength chemical products ComStar has been a leader in developing, manufacturing and marketing over 300 specialty products Designed specifically for the trade professional for more than 45 years"