Condensate is a natural by-product of compressed air. Mostly water, it also contains oils, dirt and other material. If left in your air system, it will contaminate products and cause equipment malfunction. Kaeser Eco-Drains automatically remove condensate from aftercoolers, filters, dryers, tanks and air lines. Unlike manual valves and timed solenoids, Eco-Drains ensure that condensate does not build up in your system. They sense when liquid is present and automatically discharge it, but they only open when condensate is present, saving costly compressed air.