Design for larger air supply systems: 120 Series Two Stage Pre Oil & Water Separator/ Séparateur pré huile et eauImprove air quality on your compressed air system. Located immediately after the compressor, the Tsunami Water and Oil Coalescing filters, remove these two contaminants prior to the pressured air entering into your dryer and the rest of your system requirements. This system does not qualify as a "D" grade filtration air source but will significant extend the service life of your additional breather box which is designed to meet the requirements of a "D" grade breathable source.