Respironics Millennium Micro-Disk Filter,Micro-Disk Filter,6/Pack,H621Price: USD19.79 Respironics Millennium Micro-Disk Filter is designed for use with all Millennium Oxygen Concentrators. It is the final component of the filtering system before oxygen is delivered. It is an internal part and should be replaced as necessary, on average every 2-5 years. Other products from H e a l t h P r o d u c t s F o r Y o u |