A component of a breathing circuit for directing air to a patient requiring treatment. The component comprises a tubular conduit having a male end and a female end. A locking clip is disposed on the housing adjacent the male end of the component. A plurality of annular rings are disposed on the outer side of the female end. The annular rings are engagable by a locking clip of an adjacent component. A sampling port is disposed through the housing to permit sampling of the air within the breathing circuit.