A respiratory hose assembly for the use of respiratorygases for a patient in treating various medical conditionsis present. A heated respiratory hose assembly is disclosedthat includes a pair of heated hoses and various fittingsto convey respiratory gases in a closed circuit between amedical device, such as a ventilator or CPAP device, and apatient. Such a hose assembly may be used in a medicalenvironment, such as a hospital or a non-medicalenvironment such as a patient's home. Such a hose assemblymay incorporate a relatively minimal set of components toreduce opportunities for errors in assembling thosecomponents, as well as connecting various sensors thereto,as part of preparing the hose assembly for use.