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5.5mm PVC Nasopharyngeal Airway Tube Disposable Sterile Nasal Airway ICU Application Product name Nasopharyngeal Airway Size ID(mm) 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 Material Medical PVC ...