An adapter apparatus (80) for a respiratory therapy system (2) having a pressure generating device (4) and an electrical tube assembly (22) coupled to a patient interface device (8), comprising: a wire assembly (98) having a first electrical connector (104) and a second electrical connector (100), the wire assembly (98) being structured to provide an electrical connection between the electrical tube assembly (22) and the pressure generating device (4)； a first end (84) having (i) a first port member (94) structured to be fluidly coupled to the electrical tube assembly (22) and having (ii) the first electrical connector (104) structured to be electrically coupled to the electrical tube assembly (22)； and a second end (86) having (i) a second port member (88) structured to receive a flow of breathing gas generated by the pressure generating device (4) and having (ii) the second electrical connector (100) structured to be electrically coupled to the pressure generating device (4), the adapter apparatus (80) being structured to deliver the flow of breathing gas to the electrical tube assembly (22) through the first port member (94)； wherein the first port member (94) is provided as part of a coupling member (92) having an internal chamber, wherein the coupling member (92) has a gas inlet port (96) providing access to the internal chamber to allow a supplemental gas to be introduced into the internal chamber.
