Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ¥6,720 - ¥35,214 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: ¥6,720 - ¥35,214 Quick Add Add to Wish list