Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: VT5,243 - VT27,476 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice MachinesCirculating Beer SystemsClosed Water Loop Refrigeration SystemWood Boiler SystemClosed Loop... MSRP: VT5,243 - VT27,476 Quick Add Add to Wish list