ClimateLine MAX OXY Heated Tubing is designed for use with all S9 Series CPAP/BiLevel Machines that are equipped with an H5i Heated Humidifier. It includes a supplemental oxygen port built directly into the tube so it is an ideal solution for Sleep Therapy users who also use oxygen therapy. ClimateLine MAX OXY uses built in sensors within the tube to increase temperature and humidity while preventing condensation and rainout.