How do I get the black rubber gasket back on the collection tank?

Answer: -Completely remove the rubber gasket and reattach firmly. Note that the indentation in the rubber must fit over the hard plastic post area. If you continue to experience difficulty with the gasket, please call Consumer Services at 1-800-237-7691, Monday - Friday 8 a.m. to 10 p.m., or Saturday 9 a.m. to 8 p.m., ET. A representative will assist you.