The expansion tank (conservator) is a key component that absorbs volume changes in transformer oil caused by temperature variations, thereby supporting the reliable operation of the transformer. It enables effective control of the oil level and contributes to safe and efficient performance. Expansion tanks can be manufactured either as an integral part of the transformer tank or as standalone units, depending on requirements. Customized solutions are offered with various volume, dimension, and design options in accordance with customer technical specifications and project requirements.