Stored Pressure, 2ltr, 4ltr, 6ltr and 9ltr fire extinguishers Wet chemical fire extinguishers with Class K fire risks and are designed for use against kitchen and fat fires. A unique feature of the Eurosafe wet chemical fire extinguishers is that the fat fires. A unique feature of the Eurosafe wet chemical fire extinguishers is that the reducing danger to the fire extinguishing operator.