Kaeser Eco-Drains prevent the water, oil and dirt trapped by compressed air tanks, moisture separators, dryers, and filters from building up and contaminating your product and expensive equipment. Controlled by reliable capacitance sensors, these energy saving drains remove contaminated condensate - but not valuable compressed air. The Kaeser Eco-Drain provides excellent performance in an economical package. The aluminum housing and patented air-controlled valve technology ensure many years of reliable service even when subjected to harsh condensate. Other features include dry contacts for central alarm signaling, LED's, and a test button.