Home > Terms > English, UK (UE) > Overflow tube
Overflow tube
The vertical tube inside a toilet tank that directs water into the bowl in case the ballcock malfunctions. It is usually part of the flush valve. It prevents potential water damage caused by a tank overflow. A "constant-running" condition alerts the user to a problem. On most toilets, the overflow tube also has a refill tube flowing into it, which directs water from the ballcock through the overflow tube to the bowl, after a syphon break.
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- Part of Speech: noun
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- Category: Plumbing
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