Abstract: A nasal ventilation mask supplies breathing gas to an airway of a patient. The mask has a housing defining an internal cavity and having a peripheral end defining an end opening. The end opening is in fluid communication with the internal cavity. The end opening is configured to be positioned over an airway on a face of the patient. A sealing member is connected to the housing proximate the end opening. The sealing member extends towards the internal cavity and is configured to abut the face of the patient and deflect towards the internal cavity. The housing further defines a connector assembly having an opening in fluid communication with the internal cavity. The connector assembly is configured to be operably connected to a supply of breathing gas.