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The Small Hole on the Sink That Seems Unnecessary Actually Has a Surprising Function
You’ve probably seen it a hundred times—a tiny hole near the top of your bathroom or kitchen sink, just beneath the faucet. At first glance, it might seem like a design flaw or an unimportant detail. But that small hole in the sink, often overlooked or misunderstood, actually plays a critical role in keeping your sink—and your home—safe and functioning properly.

Let’s uncover the surprising and essential function of this little sink feature.

What Is the Small Hole in the Sink?
That small hole is called an overflow hole (or simply, an overflow). It’s a built-in feature found in many bathroom sinks and some kitchen basins, typically located near the upper inner rim, opposite the faucet.

The Main Purpose: Preventing Overflow and Flooding
As the name suggests, the overflow hole’s primary function is to prevent water from spilling over the edge of the sink.

How It Works:
If you accidentally leave the faucet running or if the drain is blocked, water will begin to rise.
Instead of spilling onto your counter and floor, the water will enter the overflow hole.
This hole is connected to a secondary channel that leads back to the main drain pipe, safely redirecting excess water.
Why This Matters: