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Overflow Tube

The vertical tube inside a toilet tank (usually part of the flush valve) that directs water into the bowl in case the ballcock malfunctions. If the ballcock does not shut off properly, water will drain through the overflow tube into the bowl, and flow harmlessly over the dam and out the drain. This prevents potential water damage caused by the tank overflowing and indicates to the user that there is a problem by a "constant running" condition. On most toilets, the overflow tube also has a refill tube flowing into it. The refill line directs water from the ballcock through the overflow tube to the bowl after the siphon break.

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