Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: $4.134 - $21.666 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: $4.134 - $21.666 Quick Add Add to Wish list