2 ResMed ClimateLine Tubing for S9 Series CPAP and BiLevel machines provides consistent humidification and temperature control to reduce rainout. This heated tubing features an internal temperature sensor that monitors the air delivered to the mask, ensuring it remains at the desired level regardless of ambient room conditions. Designed specifically for use with the H5i heated humidifier, the slim and flexible hose offers a lightweight connection that minimizes drag on the mask for a more comfortable night's sleep. The simple plug-and-play design allows for easy attachment to the back of the device. This listing includes two individually sealed units.