Fixing a leaking toilet tank depends on the exact source of the leak. If water drips from the tank-to-bowl bolts, shut off the water, drain the tank, and replace the rubber washers and bolts. If water leaks from beneath the large center flush valve nut, tighten the locking nut carefully or replace the tank-to-bowl gasket. If the ceramic tank itself is cracked, replace the entire toilet. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before performing internal repairs. Verification: Test the tank with multiple flush cycles to ensure zero water leakage.
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