The SDI Comfit Spirometer Rubber Mouthpieces are specially designed for ultimate comfort with soft, latex-free rubber that eliminates the risk of allergic reactions. Additionally, the rim is dipped to accommodate the frenulum without any discomfort. The Comfit mouthpieces also feature a leak-proof seal for accurate test results as well as a versatile design that can fit nearly all PFT valves. With center support to prevent airflow restriction, the SDI Comfit Spirometer Rubber Mouthpieces are convenient and cost-effective.

Comes in Disposable or Reusable Models.