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.