1 GAL (Yellow) Super Concentrate Heat Transfer Boiler Antifreeze
Boiler Antifreeze (Yellow) Super Concentrate, 1 Gallon -NON-TOXIC
In order to get to -20º on your boiler, dilute with 1 gallon of distilled water to get 2 gallons of (-20º) below the antifreeze with a 1 to 1 ratio.