Yes, modern toilets require an overflow pipe (built into the center flush valve assembly) as a critical safety feature. The open overflow tube provides a dedicated escape route for excess water: if a fill valve fails and gets stuck open, incoming water spills directly down the hollow overflow tube into the bowl rather than pouring out over the exterior ceramic rim onto your bathroom floor, preventing a major indoor flood. Verification: Inspect the tank to ensure the top of the overflow pipe sits at least an inch below the fill valve shutoff water line.
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