An enrichment adapter apparatus for a respiratory therapy system having a pressure generating device and an electrical tube assembly coupled to a patient interface device and configured to, in use, supply a flow of breathing gas generated at the pressure generating device to the patient interface device, the adapter apparatus comprising: a wire assembly having: a first electrical connector structured to be, in use, electrically coupled to the electrical tube assembly ; and a second electrical connector structured to be, in use, electrically coupled to the pressure generating device , the wire assembly being structured to provide an electrical connection between the electrical tube assembly and the pressure generating device via the first electrical connector and the second electrical connector; a first end having a first port member structured to be fluidly coupled to the electrical tube assembly , the fist end configured to hold the first electrical connector ; and a second end having a second port member structured to receive a flow of breathing gas generated by the pressure generating device , the second end configured to hold the second electrical connector , the adapter apparatus being structured to deliver the flow of breathing gas to the electrical tube assembly from the second port member , via a main flow path which connects the second port member internally to the first port member , and through the first port member ; wherein the first port member is provided as part of a coupling member having an internal chamber that forms a part of the main flow path, wherein the coupling member has a gas inlet port providing access to the internal chamber to, in use, allow a supplemental gas to be introduced into the main flow path to be added to the flow of breathing gas, wherein the wire assembly is a jumper wire harness assembly, and wherein the first port member is a tubular port member and the second port member is a tubular port member. a wire assembly having: a first electrical connector structured to be, in use, electrically coupled to the electrical tube assembly ; and a second electrical connector structured to be, in use, electrically coupled to the pressure generating device , the wire assembly being structured to provide an electrical connection between the electrical tube assembly and the pressure generating device via the first electrical connector and the second electrical connector; a first end having a first port member structured to be fluidly coupled to the electrical tube assembly , the fist end configured to hold the first electrical connector ; and a second end having a second port member structured to receive a flow of breathing gas generated by the pressure generating device , the second end configured to hold the second electrical connector , the adapter apparatus being structured to deliver the flow of breathing gas to the electrical tube assembly from the second port member , via a main flow path which connects the second port member internally to the first port member , and through the first port member ; wherein the first port member is provided as part of a coupling member having an internal chamber that forms a part of the main flow path, wherein the coupling member has a gas inlet port providing access to the internal chamber to, in use, allow a supplemental gas to be introduced into the main flow path to be added to the flow of breathing gas, wherein the wire assembly is a jumper wire harness assembly, and wherein the first port member is a tubular port member and the second port member is a tubular port member. <EOS>