Our premium CPAP inline filters are compatible with most CPAP and BiPAP machines with 22mm tubing and 25mm mask elbow This CPAP filter works with the machine as ablow DreamStation Series DreamStation Pro Series AirSense 10 Series AirsenCurve 10 Series AirStart 10 Series Airmini Device S9 Services S8 Services System One Series sleepeasy Series PR Series M series Fisher Paykel ICON Series Devilbiss Intellipap series all Heated Tubes Machines These Universal Inline CPAP Filters are naturally hydrophobic they allow maximum filtration with a minimum loss of airflow and clean the debris and particles from the air to provide better air quality Universal CPAP Filters are easy to install and should not require recalibration on most CPAP machines Simply attach the filter to your machine between the air outlet and your standard CPAP tubing Then turn on your machine and experience a steady flow of clean pure goodtasting air Our pack includes 9 pieces CPAP filters one set satisfies your longterm need To ensure your CPAPBiPAP Machines running at high performance recommend replacing the filter every 46 weeks also depending on your frequency of use