Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ₪164.93 - ₪864.33 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice Machines Circulating Beer Systems Closed Water Loop Refrigeration System Wood Boiler System Closed... MSRP: ₪164.93 - ₪864.33 Quick Add Add to Wish list