Clogged Sink

[bsjones11]

My bathroom sink will sometimes hold water as if it is stopped up. Sometimes drains quickly. I have taken apart pipes to sink and trap and find nothing. I have used drain cleaner and all flows fine. But sometimes especially in morning it will hold water just as if clogged. Any suggestions???

[Old-Biscuit]

Air Admittance Valve on sink drain line could be staying closed.


Normally would not be an issue due to vent on waste tank BUT can affect sink draining depending on how the plumbing lines are run.

[lwmcguire]

Originally Posted by Old-Biscuit

Air Admittance Valve on sink drain line could be staying closed.


Normally would not be an issue due to vent on waste tank BUT can affect sink draining depending on how the plumbing lines are run.

Should be able to see the valve up near the bottom of the top of the cabinet

Line running slightly uphill might be an issue as well

If you have the front higher or lower does it make any difference?