A traditional swivel connector has a septum to seal the airway when the bronchoscope is in use. A plug must be inserted into the septum to seal the port when the bronchoscope is removed.
The Baska Bronchoscopy Adaptor has a septum to seal the airway when the bronchoscope is used as well as a valve to seal the adaptor when the bronchoscope is removed. The cap is only used during induction and wakeup.