Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ﷼158.19 - ﷼828.97 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: ﷼158.19 - ﷼828.97 Quick Add Add to Wish list