Transformer breathers are a cost-effective and efficient solution for managing moisture levels, especially during fluctuations in the cooling medium or airspace resulting from temperature gradients. Maintaining a low humidity level within transformers is crucial to ensure optimal performance. These breathers are equipped with self-indicating silica gel desiccant that undergoes a colour change from orange/yellow to green when saturated, signalling the need for replacement. By effectively controlling moisture levels, the risk of deterioration in the insulation properties of the cooling medium is mitigated, preventing malfunctions or equipment failures.