Propylene Glycol 1 Gallon (128 Fl. Oz.)-Highest Quality Available-From Element 6 Innovations Safe BPA Free Quart Bottle Certified USP / Food Grade Bottled In A Class 8 Clean Room Environment For Our Customer's Safety, Every Production Run Of Our Propylene Glycol Is Laboratory Tested For Purity Gallon Size (128 Fluid Ounces)