A medical tube comprising: a tube wall defining a passageway for transportation of gas, and having a first end and a second end, the passageway providing for fluid communication between the ends, wherein at least one end of the medical tube comprises: a cuff over-moulded about and attaching of one or more first pre-formed component(s), one or more second pre-formed component(s), and at least a portion of the at least one tube end, such that in use, the first pre-formed component or components is in fluid communication with the passageway, the, or each, first pre-formed component configured for fluid connection with a further component(s) of a breathing circuit, wherein the at least one second pre-formed component comprises a sensor port receivable of a sensor for sensing one or more characteristics of gas in the passageway and/or wherein the at least one second pre-formed component comprises an electrical port receivable of an electrical connector for providing an electrical supply to one or more electrically powered heater or heaters associated with the passageway, wherein the second pre-formed component or components is attachable to at least a part or parts of the at least one tube end, characterised in that the second pre-formed component or components comprises a first part housing the electrical port and/or the sensor port and a second part configured to enclose a rear surface of the first part, and wherein the first and second parts are provided with a folding region or a thinned region capable of folding or being folded, such that the first and second parts are provided as a single part, and the first and second parts are able to be fitted together. a tube wall defining a passageway for transportation of gas, and having a first end and a second end, the passageway providing for fluid communication between the ends, wherein at least one end of the medical tube comprises: a cuff over-moulded about and attaching of one or more first pre-formed component(s), one or more second pre-formed component(s), and at least a portion of the at least one tube end, such that in use, the first pre-formed component or components is in fluid communication with the passageway, the, or each, first pre-formed component configured for fluid connection with a further component(s) of a breathing circuit, wherein the at least one second pre-formed component comprises a sensor port receivable of a sensor for sensing one or more characteristics of gas in the passageway and/or wherein the at least one second pre-formed component comprises an electrical port receivable of an electrical connector for providing an electrical supply to one or more electrically powered heater or heaters associated with the passageway, wherein the second pre-formed component or components is attachable to at least a part or parts of the at least one tube end, characterised in that the second pre-formed component or components comprises a first part housing the electrical port and/or the sensor port and a second part configured to enclose a rear surface of the first part, and wherein the first and second parts are provided with a folding region or a thinned region capable of folding or being folded, such that the first and second parts are provided as a single part, and the first and second parts are able to be fitted together. a cuff over-moulded about and attaching of one or more first pre-formed component(s), one or more second pre-formed component(s), and at least a portion of the at least one tube end, such that in use, the first pre-formed component or components is in fluid communication with the passageway, the, or each, first pre-formed component configured for fluid connection with a further component(s) of a breathing circuit, wherein the at least one second pre-formed component comprises a sensor port receivable of a sensor for sensing one or more characteristics of gas in the passageway and/or wherein the at least one second pre-formed component comprises an electrical port receivable of an electrical connector for providing an electrical supply to one or more electrically powered heater or heaters associated with the passageway, wherein the second pre-formed component or components is attachable to at least a part or parts of the at least one tube end, characterised in that the second pre-formed component or components comprises a first part housing the electrical port and/or the sensor port and a second part configured to enclose a rear surface of the first part, and wherein the first and second parts are provided with a folding region or a thinned region capable of folding or being folded, such that the first and second parts are provided as a single part, and the first and second parts are able to be fitted together.