McDonnell & Miller offers liquid level controls for applications such as cooling towers, storage tanks, water fountains, condensate receivers, and more. These liquid level controls provide an air pressure signal proportional to the liquid level and are designed for use with a remotely mounted controller to allow sophisticated multi-level control in tanks, boilers and hydronic systems. They can be used to activate a low level alarm, high level alarm, pump to fill/drain a tank or any combination thereof.