I’ve never known these seals to ever fail on the DC25, are they fitted correctly?
The seals are readily available but they never fail as noted above. Why they're not on our shop. If you really want them, look up the part numbers
here and shoot us a mail
here with the part numbers you want and we'll get them in. They would be non-returnable though.
Many Dysons seem loose at the cyclone inlet and outlet, and they are designed to be that way. They pull tight when it's switched on.