If a traditional ballcock valve or modern fill valve fails to shut off, allowing water to continuously spill into the overflow tube, several mechanical issues are usually to blame. The float ball may be rubbing against the tank wall or waterlogged, preventing it from rising high enough to engage the shut-off plunger. Alternatively, mineral scale buildup, hard water corrosion, or a worn rubber washer inside the valve mechanism can prevent a tight seal, requiring a thorough cleaning or a complete replacement of the faulty assembly.
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