The Replacement 19mm ClimateLine MAX™ OXY Heated Tubing with Supplemental Oxygen Port for ResMed S9™ CPAP & BiPAP Machines exclusively designed for use with ResMed S9 CPAP & BiLevel users who also require supplemental oxygen. ClimateLine MAX OXY includes a supplemental port so oxygen can be titrated directly into your humidified sleep therapy air flow.  ClimateLine MAX OXY tubing is slightly wider than standard ClimateLine heated tubing so it can support the higher pressure levels, up to 30 CM H2O, often used by BiLevel therapy users. It features a temperature sensor at the mask end of the tube so you can set your preferred humidity and optimum temperature levels and the S9 Climate Control system will adjust your therapy to suit.