Atlas Copco EWD 50 is a Zero Loss Automatic Drain Valve. The EWD50 is reliable, as the wide drain passageway reduces the chances of blockages. Level sensor can detect problems and activate an alarm. This drain also offers energy savings, as zero compressed air is wasted during its operations. This drain valve is ideal to use with air compressors up to 138 CFM and air dryers up to 275 CFM.