Abstract: The invention comprises a swivel adapter for a ventilator breathing system serving an incapacitated patient. The swivel adapter utilizes a pair of corrugated hoses which mate with a pair of arms which are permitted to swivel on the body of the adapter. A ribbed collar is disposed on the body of the adapter and receives an endo-tracheal tube inserted within the trachea of the patient. A locking means secures the branches of the body to the swivelable arms of the adapter, and a circumferential sealing means, in the form of an `o`-ring is disposed between the branch and its receiving orifice in its respective arm, to permit secure swiveling thereof, while preventing leakage of any gases therefrom.