Leaking threads on vanity drain tailpiece?


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Old 05-14-17, 08:39 AM
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Leaking threads on vanity drain tailpiece?

I managed to get the drain connections made. I thought I was done when I spotted water bubbles forming under the tailpiece nut. See photo. I tightened the nut further. It made no difference. I closed the drain and filled the sink with water. I could hear water trickling down the drain pipe and I saw more water bubbles forming on the tailpiece nut.

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So, maybe I am not done. I have never had these issues before. Can someone explain?
 
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Old 05-14-17, 09:05 AM
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Be sure you did not cross thread the tailpiece. Throw some TFE tape on it .
 
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Old 05-14-17, 10:48 AM
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The tailpiece is not sitting squarely on the sink. Note the gap above the washer on the front side as compared to the sides? It may need to be corrected so the washer sits flatly. Did you use plumber's putty on the drain on top of the sink hole?
 
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Old 05-14-17, 02:14 PM
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Hi Chandler,

Yes, I used plumbers putty up top. I think I did not use enough though. I think I am getting some leakage past the plumbers putty even when the sink stopper is closed. You can hear it dripping in the drain to the P-trap.

I will pull it all out and start over again employing the feedback I have gotten here. Thank you for your help.
 
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Old 05-14-17, 03:32 PM
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Your problem is typical even with experience in plumbing, pop ups will leak past the large basin washer (from the inside diameter).
The putty under the pop up flange is only to hold water in the bowl, not to prevent leaks from below.

Back the nut and basin washer down and add more putty under the flange.
Apply Teflon Paste to the external threads of the pop up and retighten the nut.
Snug the nut up and test for leaks.
Dry all parts before applying the paste, it can be used immediately after.
 
 

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