Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: $74.06 - $388.13 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice MachinesCirculating Beer SystemsClosed Water Loop Refrigeration SystemWood Boiler SystemClosed Loop... MSRP: $74.06 - $388.13 Quick Add Add to Wish list