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QRS Pre Calibrated Mouthpiece (100 Box) Warranty_6 Years 2 inch dual wheel EDN 12 08 208006 2 inch dual wheel Zoll Sidestream Airway Adapter Kit Specifications: The Pressure Tube (#Z 7000 2032) connects the Pre Calibrated Mouthpiece to the QRS spirometers The QRS mouthpiece reduces the liability for cross contamination and eliminates the need for sterilization
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