The HumidX™ Plus for AirMini™ Travel CPAP Machine (3 Pack) is a package of three HumidX™ Plus units designed to replace the optional waterless humidification element of the AirMini™ CPAP machine. When used with the AirMini™ during sleep therapy, the HumidX™ Plus sits in the bulbous connection between the two pieces of CPAP tube. It is only compatible with the AirFit™ N20 and AirFit™ P10 masks that are purchased with the AirMini™ device. To support the design, the tube and elbow connection differ from the current AirFit™ N20 and AirFit™ P10 masks. Please Note: This product is only compatible with the mask setup provided for the N20 and P10 masks associated with the AirMini™ travel machine.