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The small hole on the sink, which seems unnecessary actually has a surprising function

The small hole on the sink, which seems unnecessary actually has a surprising function

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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:

  • Prevents flooding and water damage to your floors and cabinetry.
  • Gives you extra reaction time in case of accidental overflows—especially useful in busy households or homes with kids.

Bonus Function: Improving Drain Efficiency

In addition to preventing floods, the overflow hole also helps your sink drain faster.

Here’s Why:

  • It allows air to enter the drain line while the sink is draining.
  • This reduces suction and allows water to flow out more quickly and smoothly.

Think of it like pouring liquid from a bottle—when there’s no airflow, it glugs and slows down. With an overflow hole, airflow is maintained, and draining becomes more efficient.

Hygiene Tip: Keep It Clean!

Since the overflow hole is often out of sight, it can become a trap for:

  • Soap scum
  • Toothpaste residue
  • Mold and mildew