Wet Chemical Extinguishers Class K "Kitchen Use" contain a special potassium acetate based, low PH agent developed for use with pre-engineered restaurant kitchen systems (included in the NFPA 10 1998 edition).  The recent tread to more efficient cooking appliances and use of unsaturated cooking oils dictates the use of hand portable fire extinguishers, with greater fire fighting capacity and cooling effect.  Unit come fully charged.