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Lift off the ceramic tank lid carefully and set aside on a towel. Look inside to identify your flush valve type.
The flapper is the rubber seal at the bottom. If it's warped or cracked, replace it ($5 at any hardware store). Chain should have slight slack—not too tight, not too loose.
Find the float (cup or ball). If water fills above the water line mark, pinch the clip and slide the float down slightly. Test flush.
Flush and watch. Tank should stop filling when water reaches the line. Listen for running water after tank fills—if silent, you nailed it!
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