Silica Gel Breather is used in power transformers and other electrical equipment to protect them from damage caused by moisture. They work by filtering the air that enters the equipment and removing any moisture present in it. It is important because moisture can lead to the formation of acids, which can corrode the metal components and shorten the lifespan of the equipment. Silica Gel Breather contains silica gel, a moisture-absorbing material that changes colour as it absorbs moisture. When the silica gel is dry, it appears blue or light green, but as it absorbs moisture, it changes to pink or white.