Compact 525DS Home Oxygen Concentrator Package (5 LPM) 61721 and it allows the machine

and it allows the machine to be used without engaging the built-in HumidAir Humidifier

This is the Flip-Top Lid (Cover) with Seal that closes and covers the removable humidifier chamber used on all H4i Humidifiers as well as HumidAir 3i Heated Humidifiers

is the original headgear designed for use with all DreamWear Nasal and DreamWear Nasal Pillow CPAP/BiPAP Masks

so users can enjoy a good night’s sleep

It will ONLY work with ResMed's ultra-portable AirMini CPAP Machines

Compact 525DS Home Oxygen Concentrator Package (5 LPM) 61721 and it allows the machineMade in the USA, the robust DeVilbiss 525DS Compact Oxygen Concentrator offers just the right balance of cool and quiet for home users. The simplified cabinet design allows for 15% typical sound quality improvement and improved system cooling. Innovative Turn Down Technology helps reduce energy bills while still providing high quality, continuous oxygen flow at settings up to 5 LPM 24 hours a day, 365 days a year.