RollFit Nasal Cushion (Seal) for F&P Eson CPAP/BiPAP Masks Size:Large SmallMedium

SmallMedium

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

A check valve is included free as well

Large & ExtraLarge -- are available

This Standard Water Chamber is designed for use with the HumidAir Humidifier in all AirSense 10 Series CPAP Machines and AirCurve 10 Series BiLevel Machines

RollFit Nasal Cushion (Seal) for F&P Eson CPAP/BiPAP Masks Size:Large SmallMediumFisher & Paykel's RollFit Nasal Seal is designed for use with all F&P Eson CPAP BiPAP Masks. As the name suggests, the one piece RollFit Seal rolls back and forth on the nose, auto adjusting during sleep to reduce pressure on hard to fit areas, like the bridge of the nose, while increasing overall seal and comfort. Three sizes are available Small, Medium & Large.