The ABC's of Plumbing - Overflow Tube

An overflow tube is a vertical tube inside the tank of a toilet. Its purpose is to move water into the bowl in the case where the ballcock malfunctions to prevent water in the tank from overflowing. When the flush lever is pressed, it pulls the chain that opens the flush valve. When the valve opens, water rushes into the toilet bowl. The water level of the tank lowers after a flush. The water leaves quickly and the tank begins to refill. As the tank refills, some of the water goes from your fill valve through the refill tube and in the overflow tube. The job of the overflow tube is to empty the water directly into your toilet bowl.

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