Comfortable. Convenient. Cost-effective.

Designed for the ultimate in comfort, Comfit mouthpieces are the low-cost alternatives to other mouthpieces. An exceptional leak-proof seal assures better test results. And the versatile design fits most PFT valves and filters. Disposable or reusable models.



ComFit D

Comfit D
  • Soft, latex-free rubber eliminates risk of allergic reaction
  • Center support prevents airflow restriction
  • Rims dip to comfortably accommodate the frenula


ComFit R

Comfit R
  • Same design as Comfit-D PLUS
  • Autoclavable Kraton® material

Download Comfit Brochure.


Comfit™ Mouthpieces

     Part No.  Description  Qty  Packaging
ComFit D      29-7710-025 Comfit™ D - Disposable Mouthpiece 25 Box
   29-7710-050 Comfit™ D - Disposable Mouthpiece 50 Box
     Part No.  Description  Qty  Packaging
ComFit R     29-7720-010 Comfit™ R - Reusable Mouthpiece 10 Box
   29-7720-030 Comfit™ R - Reusable Mouthpiece 30 Box



PulmoGuard kit

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PulmoGuard II Kit

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Contact Information


SDI Diagnostics
Ten Hampden Drive
Easton, Massachusetts 02375
Phone: (800) 678-5782
Fax: (508) 230-2752 

SDI Diagnostics