Quick view Douglas Products Douglas HTF Inhibited Propylene Glycol MSRP: $58,54 - $306,79 Douglas HTF Inhibited Propylene Glycol in 1 Gallon Containers Recommended for: Block Ice MachinesCirculating Beer SystemsClosed Water Loop Refrigeration SystemWood Boiler SystemClosed Loop... MSRP: $58,54 - $306,79 Quick Add Add to Wish list