1. Be sure the "Duck Bill Gasket" is all the way in place. If it is not pushed all the way in, into the collection tank, it will cause the collection tank to leak. The gasket can only go in one way.
2. Make sure there is no debris stuck in the "Crevices" in the "Duck Bill Gasket." If there is debris in the crevices, the gasket will not go all the way into the collection tank properly and it will cause it to leak. See pictures below:
3. Make sure the separator stack inside the collection tank is in place properly. The arrow on the separator stack should be in line with the lock icon on the collection tank. If it is not locked into place, the collection tank will leak, or it will leak out the bottom of the machine. See Picture below: