The floor around the toilet is wet.
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Remove the tank cover and place a level across the top of the tank.
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Locate the mounting nuts and bolts underneath the tank.
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Using a wrench, tighten the nuts on each side one-quarter turn at a time.
Important: Turn only the nuts. Do NOT turn the bolts.
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Go back and forth until the tank is secure.
Important: It is important to tighten the nuts evenly or the china may break.
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Does the problem persist?