This is the electronic heated tube for a ResMed S9 humidifier. It is called a ClimateLine tube and engages the automatic climate control feature of the CPAP machine. The tube is heated to help prevent excess condensation build up in the tube in the changing seasons.

ResMed’s 6ft Air Tubing for CPAP machines comes in two sizes with the option of with or without cuff on the 6ft piping. Tubing is universal for all ResMed CPAP machines.