Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ¥6,800 - ¥35,637 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice MachinesCirculating Beer SystemsClosed Water Loop Refrigeration SystemWood Boiler SystemClosed Loop... MSRP: ¥6,800 - ¥35,637 Quick Add Add to Wish list