Sleek, lightweight (405g) balanced environmentally sealed 1st stage provides consistent airflow and eliminates freeze up. New polyurethane high pressure seat outlasts rubber and is backed by a "3-year guarantee". One high pressure port, four low-pressure ports. Stainless steel conical mesh filter increases flow rate and is cleaned, not replaced, during servicing. Electro-carbon plating eliminates corrosion and bacteria. Supplied with Bio-Filter "Clean Air System", moisturizer pad, and 2 x medically approved filters. Lightweight swivelling 2nd stage reduces jaw fatigue. Three effect of Clean air system: 1.Moisturize your air! 2.Safe, Clean, Natural air from any scuba regulator! 3.Generation of negative ions.