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A fully automatic, zero loss drain that protects compressed air systems with out the need for electricity. Translucent reservoir for visual assurance of operation. Ideal to be used along with Oil/Water Separators. Demand drains use a sensor mechanism (a float ball connected to a level sensor) to detect when the condensate level has reached full capacity inside the drain before actuating the valve and releasing the condensate. That avoids any chance of the drain opening too often or not often enough, and also eliminates any air loss by leaving a residual amount of condensate inside the reservoir when it actuates to prevent any air escaping.