If it is leaking anywhere except at the connection for the drain line, you need to replace the unit. If it is leaking at the rubber seal where it connects to the sink, then check to see if it is tight. If it is tight remove the unit and see why it is leaking. It may be the seal is torn or broken. A leak at any anyplace else is not repairable.
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If it is leaking anywhere except at the connection for the drain line, you need to replace the unit. If it is leaking at the rubber seal where it connects to the sink, then check to see if it is tight. If it is tight remove the unit and see why it is leaking. It may be the seal is torn or broken. A leak at any anyplace else is not repairable.