The ResMed ClimateLine™ heated tubing is smaller, slimmer and sleeker than a standard mask tube that offers greater flexibility and less mask drag for a more comfortable night’s sleep. It is engineered to enhance your CPAP therapy journey by ensuring through its ability to deliver air at consistently comfortable temperature and humidity levels. This tubing is intended exclusively for utilization with devices from the S9 series, precisely when the H5i humidifier is affixed. If you employ your S9 device independently without the H5i humidifier, kindly use the SlimLine or Standard air tubing instead. Pay by insurance? Please call (877) 799-0202.