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The Safe-t-Chek mouthpieces adapt to most spirometers, peak flow meters and other PFT devices! Its innovative design virtually eliminates the threat of cross-infection. Patients worry about getting germs from others now they can relax with Safe-t-Chek. The unique 8-point peripheral support creates a complete seal, as the valve closes completely if the patient attempts to inhale. This interrupts air flow, preventing the passage of airborne infectious particles.