That’s what the second hole in the bathroom sink is for. It has an essential role.

The second hole in your bathroom sink, known as the overflow hole, serves an essential purpose in maintaining the functionality and safety of the sink. Here’s why it’s there and what it does:

The Role of the Overflow Hole
1. Prevents Overflowing
The overflow hole acts as a safety feature. If the water level rises too high—whether due to a clogged drain or leaving the tap on accidentally—the hole provides an alternative exit for water, preventing the sink from overflowing and causing water damage.
2. Aids Drainage
The overflow hole helps air enter the drainage system, which allows water to drain more efficiently. This reduces the chance of creating a vacuum that might slow down water flow.
3. Improves Hygiene
By reducing standing water, the overflow hole minimizes the risk of bacteria and mold buildup that can occur in stagnant water.
How It Works
The overflow hole connects to a channel inside the sink that leads directly to the drainpipe. When the water level reaches the hole, it flows through the channel and into the drain, bypassing the main bowl.
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