This item has been discontinued by the manufacturer and is no longer available. It is listed here for reference only.
One replacement chamber for the Respironics REMstar M-Series R2 Heated CPAP Humidifier. The R2 chamber was redesigned to correct problems that the previous R1 generation had with water leakage between the halves of the chamber. The gasket is much larger, the plastic chamber halves are much thicker and more robust, and Respironics has improved the latch mechanism. The air outlets on this chamber are rectangular and side by side. If the chamber you are replacing has round air outlets that are offset then you need the newer R3 humidifier chamber