Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ﷼162.97 - ﷼854.02 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice MachinesCirculating Beer SystemsClosed Water Loop Refrigeration SystemWood Boiler SystemClosed Loop... MSRP: ﷼162.97 - ﷼854.02 Quick Add Add to Wish list