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These cushions will fit the frame of the FlexSet or FlexSet II Nasal Mask and the Serenity or Serenity II Nasal Mask.
DeVilbiss changed its naming convention as of December 2012.
Shallow is now referenced as Small
Standard is now referenced as Medium
The cushion is stamped with the name Serenity only. It does not have the name FlexSet stamped on it. Serenity is stamped along the lower edge of the cushion, along the long part that will rest above the upper lip. The Gel cushion has the letter G stamped after Serenity.
The size Small cushion has the letter S stamped after the word Serenity.
The size Medium cushion has only the word Serenity stamped on it.