I just installed a sink drain.
The drain has two retangular holes (about 1" by 1") in it just below
the top surface
of the sink and above the underside surface of the sink (above the
What are the purpose of these holes? Seems like they just provide a
the outersurface of the drain and the inner surface of the hole in the
sink where the
drain fits. Drain water must accumulate in this cavity, I would think?
There should be an "overflow" slot in the sink up near the top edge.
The water that goes through the overflow has to be able to get into the drain
pipe, even if you have the plug in the basin, so it comes in the sides.
Thanks, this sink does not have an overflow slot, so they serve no
it. I guess any water that gets into these holes (gets caught in the
cavity) will have to just evaporate out. This is a guest bathroom
is not used often
I could try filling the cavity, but I would have to take the plug
Those slots let the overflow water into the tailpipe. If you don't
have an overflow, and the trap clogs, what's to stop water from backing
up out of those holes?
When I installed a sink with no overflow (integral glass bowl and
countertop) it came with it's own drain assembly that didn't have the
Well it sounds like you have a sink with an overflow that has a
tailstock that has no provision for that. So whoever put it in that way
made a mistake. If it's not used very often it's probably not a
problem. It would take water trapped in there a long time to evaporate.
I have kids and this would definately be a problem.
I'm not familiar with a vent under the sink. Usually the air is taken
in at the sink overflow which is on the inside surface of the sink near
the top as MasterBlaster posted, but I'm pretty sure that's what you're
looking at - vent holes.
That would be the over flow. Some sinks have them some do not. Your
drain (actually the part called the tailstock) should have rectangular
holes in it just below the stopper to allow the water that runs into
the overflow to drain out.
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