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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???

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Greetings!  Interesting problem.  I wonder if maybe your vent is clogged?  Long shot, but worth looking at.  Good luck!

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Are you in a cold climate? Since you say it's worse in the morning I'm wondering if you have frost building up in the vent cap overnight.

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Don’t know what kind of MH you have. It would help if you posted that. On ours, under the sink, in the cabinet there is an AAV, if you have one, it could be defective and sticking at times.

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