Philips Respironics Pollen Filters for PR System One/M Series (Black 2pk) CPAP These work together to: Allow

These work together to: Allow Freedom of Movement: The seal remains stable and flexible

Keep your sleep therapy practical

Extend the lifespan of your CPAP setup without replacing the entire mask system

Are prescribed high-flow Oxygen requirements

Philips Respironics Pollen Filters for PR System One/M Series (Black 2pk) CPAP These work together to: AllowBlack washable pollen filters For Philips Respironics "M" Series or Philips Respironics System One CPAP Machines. Compatible Machine List: Philips Respironics System One Range 50 Series or 60 Series Philips Respironics M Series Pro Philips Respironics M Series Auto Philips Respironics M Series Bi PAP Auto Philips Respironics M Series Bi PAP Plus