Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ₩60,137 - ₩315,146 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: ₩60,137 - ₩315,146 Quick Add Add to Wish list