Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: F4,804 - F25,178 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice MachinesCirculating Beer SystemsClosed Water Loop Refrigeration SystemWood Boiler SystemClosed Loop... MSRP: F4,804 - F25,178 Quick Add Add to Wish list