The purpose of these silica gel breathers is to absorb the moisture in the air sucked in by the transformer during the breathing process.
Silica gel breathers are filled with Blue Silica gel (Indicating Type) which has the moisture absorption capacity and signals the saturation degree by changing its color.
Silica gel in the breather will be blue when installed and they turn to pink color when they absorb moisture which indicates the crystals should be replaced.
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