DiversiTech PG-PLUS-5 Glycol, Blue, 5 gallon is a concentrated inhibited propylene glycol-based industrial heat transfer fluid and antifreeze that contains food grade corrosion inhibitors. Suitable for use in potable water systems. Designed to provide freeze and burst protection, excellent thermal conductance, and protection against corrosion and fouling. ProTek-Plus must be mixed with water in order to provide the desired freeze and burst protection.