The ceramic porcelain bowl and tank of a residential toilet can theoretically last for decades (often 50 years or more) because fired ceramic is virtually indestructible under normal operating conditions. However, the internal mechanical parts—such as the rubber flapper, fill valve, flush valve gasket, and tank-to-bowl bolts—wear out and require routine replacement every 5 to 10 years to prevent leaks and running water. Verification: Inspect internal tank components and porcelain structural integrity during routine home maintenance checks.
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