The heavy vitreous china ceramic bowl and tank of an American Standard toilet can easily last decades or even a lifetime (often fifty years or more) because high-fired porcelain does not degrade under normal household conditions. However, internal mechanical components housed inside the tank—such as plastic fill valves, rubber flappers, canister seals, and trip levers—typically experience wear and require minor maintenance or replacement every five to ten years to keep the fixture running smoothly.
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