ResMed ClimateLine Tubing
Please see below
The ResMed ClimateLine heated tubing takes advantage of a temperature sensor located in the mask to reach relative humidity. This feature ensures that condensation will not form inside the tube. This tubing is designed for use the S9 CPAP Series and H5i Climate Control System. Measures 78 inches in length with an internal bore diameter of 15mm. The ClimateLine tubing will work with any mask.