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

Not recommended for use with Full Face Masks (as the mask itself covers the mouth)

Keep your sleep therapy practical

cushiony pocket of air that seals gently both in and around your nose

Regularly replacing your cushion ensures an airtight seal and maintains the exact therapy pressure your machine prescribes

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