An overhead tank is a large container typically placed at an elevated position, such as on rooftops or support structures, to store water. It is commonly used in buildings or areas where water pressure from the municipal supply is insufficient to meet the demands of the occupants. Overhead tanks are connected to the main water supply and provide a gravity-fed source of water for various purposes like drinking, cooking, cleaning, and firefighting. They often have valves and pipes for filling and distribution and may incorporate features like level indicators to monitor water levels.