The FlexiFit HC406 is the petite size nasal CPAP mask. The bottom of the mask frame is labeled with the mask name: HC406. When examining the front of the mask, the name is printed below the glider strap. The FlexiFit HC406 cushion is replaceable, but there are no identifiable marks on the cushion or flap. The size of the cushion reflects the size of the mask frame.
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