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  1. Flutter Valve vs. Acapella: PEP Therapy Devices (2024)

  2. How Do You Use a Flutter Valve or Acapella? - COPD.net

  3. Positive Expiratory Pressure (PEP) Devices - Physiopedia

  4. Acapella ™ Respiratory Therapy Systems - ICU Medical

  5. Flutter valves for COPD: How they work and how to use

  6. Flutter valve devices & flutter valve therapy - Health Jade

  7. PEP device - CHARLOTTE CF FAMILIES