Flexifit 432 sizes

[Budman]

I use a flexifit 432 mask. I have always thought the medium was a bit too small. Is the only difference between the medium and large the seal? Is the plastic part the same on all sizes. I see on ebay I can get medium and large seal for $20.00 (Aftermarket) But I didn't know if the large seal would fit my medium mask.
Thanks

[Julie]

I think you mean the 'cushion' (seal is what the cushion hopefully does if you're lucky) but you'd have to call e.g. Cpap.com to find out if the mask frame fits different cushion sizes - every make and model of mask is different and sometimes they're interchangeable and sometimes they're not.