Ultrasonic cleaning unit needs repaired?

Recently someone gave me an L%26amp;R ultrasonic cleaning unit that was broken, after changing the fuse the machine would turn on but it smoked under the tub, turning the tub over I found that there are two disks glued to the bottom of the tub and one of them is cracked. I don't know much about these things and simply giving the name of the part would be a great help (though if you know how to repair, or where to attain a new one don't hold back =))

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