Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: ƒ78.32 - ƒ410.44 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice MachinesCirculating Beer SystemsClosed Water Loop Refrigeration SystemWood Boiler SystemClosed Loop... MSRP: ƒ78.32 - ƒ410.44 Quick Add Add to Wish list