why is there a hole in bathroom sinks? Is it for drainage?

Answer 1

so if the bath/sink overflows it doesn't flood... ... ...

Answer 2

Bathroom sinks usually have a plug which inables the regular drain to be closed. This allows for a basin of water for washing, shaving, etc. If the drain is plugged and the water is left on, the sink could over flow. The hole you refer to is connected to the drain. It prevents the sink from over flowing if the regualr drain is closed and the water is left on.

Answer 3

When plumbing moved indoors from the outhouse, people complained about the lack of creepy crawly things in there new bathrooms. Recognizing the problem, manufactures began building homes for the little critters in the design. Some think lobbying by PETA was the reason. I do think they went too far when they built all the "spider holes" under the rim of the toilet - ooch, ooch, ouch, ouch !

Answer 4

Yes, if you look at the under side, it is a formed passage that travels down and dumps into the drain, keeps the sink from getting overflown when you have the regular drain closed.

Answer 5

It is an overflow. If you look or feel inside the main drain hole towards the front of the drain you will feel the place it connects into the tailpiece pipe of the drain.

Answer 6

That's to stop the sink from overflowing if the tap is left on when the plug is in.

I thought you meant the plug hole at first, lol.

Answer 7

Which hole? The bottom one or the one near the top? The one near the top is designed to prevent overflow. It's connected to the bottom drain and allows water to drain out even when the bottom drain in closed.

Answer 8

What kind of a question is that?
Are you talking about the hole that is up high? Yes, It's for when is overflows.

Answer 9

to prevent them from running over. the hole leads right back to the drain pipe.

Answer 10

To keep them from overflowing if you leave the water running and leave.