Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ﷼163.00 - ﷼854.19 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: ﷼163.00 - ﷼854.19 Quick Add Add to Wish list