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"The part that this replaced had a locking O-Ring inside the mask that kept it securely fastened. This model does not and relies on a "click-fit" that comes undone during normal tossing and turning of a night. Its very annoying to have to feel around in the dark to refasten this thing to the mask. It disturbs my sleep even more than just the typical waking up because I have to concentrate and focus to refasten it. Bad design."