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All CPAP tubing is compatible with the CPAP masks. The biggest issue we see is that connectors from old masks are left in the end of the tubes. The attached video shows what to look for and how to pull the old connectors out.

If the tubing is too loose for the mask, this suggests that the tube has warn out and needs to be replaced. There is quite a bit of air and moisture that passes through these tubes, so ensuring this is changed from time to time will also be beneficial for hygiene reasons.