I'm not sure about the FlexiFit but I do know that some Quattros had(may have been upgraded now) a problem with the elbow which was fixed with teflon tape. You can do a search on "teflon fix" and see if the FlexiFit is mentioned having a problem too. Thanks. I will check it out. The less noise the ...

Here is an update on my post, seem to be alot of views on it, though no input. Leo, That was probably me on the other forum Fisher Paykel told me to get the valve replaced, but the DME replaced the whole mask. This one leaks just as much as the first, about an hour after turning on the machine. I'm...

Here is an update on my post, seem to be alot of views on it, though no input. I did call my DME about the flexifit mask, they said it shouldn't leak through non-rebreathing valve and gave me a brand new mask which made the excact same SSSSHHHHHH sound of air leaking through the valve. I contacted t...

I just started using my Flexifit 431 mask 1 week ago. Everything is going well except last night I noticed an annoying hissing sound of air leaking through the Non-Rebreathing Valve (Item J in the manual, attached to the elbow, not the tiny holes at the nose bridge). This went on all night and I got...