Sink drain question/leak

[Gdosh]

Could anyone please tell me what the hole circled in red on the sink drain is for? It seems that water is getting in there and leaking around the seal circled in yellow even though the nut seems tight for the bottom gasket. Thanks in advance.

 

[ShaunCorbs]

Normally the red circle is for an internal overflow on the sink (already manufacturer/ made into the sink)

Is the face where the rubber goes clean and free of contamination eg old silicon / putty

 

[Rob876]

That's probably the overflow point, rubber gasket and silicone it tight, there are different types and they aren't always easy to seal.

 

[centralheatking]

What happens is the outfits that sell the sinks and toilets source the products from different manufacturers and sometimes they dont properly interface the end product
so its left to the end user to make their own arrangements. centralheatking

 

[DuncanM]

I have had to on more than one occasion get another waste with no overflow. Poorly manufactured product. Usually from China.

 

[centralheatking]

I have had to on more than one occasion get another waste with no overflow. Poorly manufactured product. Usually from China.

or buy loads of silly con chking