This galvanised zinc fire extinguisher is designed to be used in heavy aggressive environments. The painting process involves pickling the steel cylinder with a phosphorous coating ,drying then spraying a zinc coating which is passed through the powder coating kiln. The units are then sent through the powder coating for the final red powder coating finish. These are ideal for use in aggressive enviroments such as mining, marine, transport or anywhere where a heavy duty fire extinguisher is required.