Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ﷼158.23 - ﷼829.20 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice MachinesCirculating Beer SystemsClosed Water Loop Refrigeration SystemWood Boiler SystemClosed Loop... MSRP: ﷼158.23 - ﷼829.20 Quick Add Add to Wish list