To find the size of the cushion, turn the mask to look at the flat bottom of full face cushion. Large embossed letters spell out the words "S M A L L," "M E D I U M," or "L A R G E." The words are found near the rim connecting the mask frame to the full face cushion.
Frame and Cushion Compatibility
The HC432 foam insert and silicone cushion will not fit the HC431 frame.
The HC431 silicone cushions made after April 2006 will fit the HC432 frame. The HC431 silicone cushions made before April 2006 will not fit the 432 frame.
The Flexifit HC432 mask size runs a bit smaller than the Flexifit HC431.
The manufacturer has stamped the part number (431 or 432) identifying the mask on the upright bar for the forehead support. The manufacturer did not include the alpha characters "HC" in front of the numeric characters.
While you may find the information provided on this site helpful, please understand that it is not in any way intended to replace
the advice of a physician or medical professional. If you're concerned about your health or worried about specific symptoms,
please consult a doctor. If you have additional questions about our site, please consult our
for more information.