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Home depot (and Lowes) sells a pack of 10 or 12 for $1.39 each. For small size, #9 size will work, #10 for medium, #11 for large

Janknitz, I just noticed that is a rubber o ring. How long have you been using it that way? Aren't those pillows silicone? Usually rubber + silicone = strange morphy things happen.

So far I haven't noticed any problems. I take the ring off to make sure the neck of the pillows gets washed well at least once a week, and everything seems fine. My nasal pillows will get changed out pretty often--I've joined "the great pillow exchange" with the hopes of having spares and I can get a whole new mask every three months. So I'm not too worried.

Janknitz wrote:

Janknitz, I just noticed that is a rubber o ring. How long have you been using it that way? Aren't those pillows silicone? Usually rubber + silicone = strange morphy things happen.

So far I haven't noticed any problems. I take the ring off to make sure the neck of the pillows gets washed well at least once a week, and everything seems fine. My nasal pillows will get changed out pretty often--I've joined "the great pillow exchange" with the hopes of having spares and I can get a whole new mask every three months. So I'm not too worried.

That's good to know. I plan to switch mine out often too so I won't worry so much about the material when shopping for o-rings. Thanks

DTSM--thanks for the sizing and where to get these- "O" rings!--:) I have gone back to using the Swift Lt for Her but I am anxious to go back and give the FX another try soon,

Carrie