Considered a specialty agent, Wet Chemical (potassium acetate) is highly effective in extinguishing K class fires, particularly those found in deep, fat fryers. These fire extinguishers are typically required in a commercial kitchen setting.
These units ship charged. To recharge, the units require a valve and an adapter to connect to the unit and thus pressurize with a compressor. The units can be charged
without these items if you take the fire extinguisher to a local fire extinguisher service
firm (will charge the unit for you, usually for free).