Sink Not Draining


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Old 05-09-21, 05:00 PM
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Sink Not Draining

We have a house where the bath sink takes forever to drain. (See pic for reference.) Thing is, a plumber verified the drain line is clear.


Then I went further by taking the sink strainer apart from the drain line and pouring lots of water down the pipe with NO draining problem.

So put it back together and the sink is still very slow. At this point I am thinking it's an air entry problem and it needs an air admittance valve. Questions:

--Does this diagnosis make sense?
--Can I know for sure? (Possibly by testing via poking a long straw through the sink flange strainer to let air enter, seeing if it drains better)
--Since it is a wall mount sink with an exposed drain and polished chrome pipes, would there be an AAV that would match this hardware? Thanks!
 
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Old 05-10-21, 04:07 AM
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Clarification needed. Is this a sink or a bath drain. The strainer looks like a shower or a bath drain. A sink would have a pop-up stopper.
 
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Old 05-10-21, 05:06 AM
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No, this is sink drain. This is paired with a faucet with no pop-up...
 
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Old 05-10-21, 05:14 AM
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I have sometimes had problems with strainers like that. They love to trap a bubble of air underneath the grate that acts like a blockage. Try removing the strainer and see if the problem is any better.
 
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Old 05-10-21, 05:21 AM
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Thanks! I think then I will replace it with a push-type strainer where it pushes open and closed by hand. The one I'm thinking has much bigger drainage holes.
 
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Old 05-10-21, 05:12 PM
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I put in the push type pop up (no lift rod) today and it drains much better. Thanks!
 
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Old 05-10-21, 10:13 PM
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It looks like you have a glass bowl vessel, which usually doesn’t have the little overflow hole near the top of the bowl. That little hole allows trapped air to get out of the way, the bubble problem as someone previously said, Any tight strainer is going to have a problem with that style of sink. I like lift and turn drains the best in that application, but pop ups are nice too, however I think they tend to get gummed up more often.
 
 

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