The diffuser cap with filter sits between the mask frame and the short tube
And if you ever need a replacement cushion they're sold separately so you can just buy the parts you need
and make minor adjustments with the tiny headgear clip for a custom fit
Unlike other machines where the addition of a humidifier can make the system much bulkier and unfriendly to travel with
Sunset - RES042 - CGA 870 style regulator 0-8 lpm Pulse The diffuser cap with filterCGA 870 style valve connection for E size or smaller cylinders Flow selector window shows 12 settings between 0 8 LPM: 0, . 5, 1, 1. 5, 2, 2. 5, 3, 4, 5, 6, 7, 8 Comes with T handle for easy mounting no tools required Barbed hose outlet for easy connection to the oxygen tubing Pressure gauge reads to 3000psi Easy click flow selector knob Heavy duty brass core and durable anodized aluminum body Input Pressure: 2200psi Output Pressure: 50psi Lightweight