A nasal cannula fitting, comprising in combination, a rigid plastic tubular first duct configured to directly endwise connect with apparatus assisting respiratory air, a relatively flexible plastic second duct fitting onto an end portion of the first duct, relatively flexible third plastic ducts integral with the second duct and diverging endwise therefrom to receive flow of the assistance air, and nasal cannula plastic tubing connected in series with the respective third ducts. Nasal prongs on the cannula tubing may carry pressure sealing toggling skirts.
