Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: 16.389 - 85.884 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: 16.389 - 85.884 Quick Add Add to Wish list