Patent ID: 8544465

Claim:
A CPAP system, comprising a flow generator configured to generate a flow of breathable gas to be delivered to a patient; a tub configured to contain a supply of liquid, the supply of liquid used to humidify the breathable gas generated in the flow generator; and a connector adjacent to an inlet opening in a facing surface of the tub, the connector comprising a main body having a first end and a second end; a channel extending axially through the main body from the first end to the second end and configured to deliver the flow of breathable gas to the tub; an attaching portion provided at the first end of the main body; and a flexible bellows sealing portion provided at the second end of the main body, the flexible bellows sealing portion comprising two bellows convolutions including a face seal consisting of a distal one of said two bellows convolutions, said distal one of said two bellows convolutions formed with a sealing face surrounding a bellows aperture that, prior to engagement with said facing surface, is larger than said inlet opening, such that said sealing face will, in use, fill with breathable gas and expand due to said breathable gas to establish a pressurized face seal with said facing surface about said inlet opening.