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Old 06-29-2010, 09:47 PM   #1
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Drain Gasket Leak


I've read many threads with many different opinions...might as well get some more...
I've just put in a new sink and drain. The sink holds water fine with the plunger down but when allowed to drain or with water running freely it leaks around the rubber gasket (where the tail piece enters the sink).
I've read to silicone the gasket, plumbers putty the gasket, silicone putty the gasket etc etc. Any expert opinions?
Thanks in advance.
RT

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Old 06-29-2010, 09:56 PM   #2
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Drain Gasket Leak


For some reason, a lot of people are putting these things in backwards.

Start from the top.

Basket

putty

put on sink

rubber washer

fiber washer

(cup if applicable)

Nut

Tighten down

Attach sink parts.

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Old 06-29-2010, 10:07 PM   #3
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Drain Gasket Leak


Yup...its all in that order. I imagine the "cultured marble" just has voids that are too large for the rubber gasket to fill...hence the leak. I guess the simple question is...what should I fill the voids with?
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Old 06-29-2010, 10:15 PM   #4
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Drain Gasket Leak


Is this a vanity? often the hole in the bottom of a cultured marble sink is rough or has a burr.

Remove the pop-up assembly and check that the marble hole is good--often a little smoothing with a knife or sandpaper is all that it takes.---Mike----

Alans description was for a kitchen sink strainer ,I think.---Mike---

As a last resort---apply a little silicone caulk to the sink bottom hole before tightening up the rubber gasket.

Last edited by oh'mike; 06-29-2010 at 10:17 PM.
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Old 06-29-2010, 10:36 PM   #5
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Drain Gasket Leak


Sorry, plumbing terminoligy got me... sink = kitchen lavatory = bathroom


If you're referring to a bathroom sink, pull off the pop - up assembly. Slide the nut, washer, and gasket down. Apply a bead of siliconized acrylic caulking to the THREADS just above the rubber gasket. NOT REGULAR SILICONE. We use DAP alex plus. When you put it back together and tighten it, the caulking will be forced into the threads, and seal them. We never get a good seal on those threads for some reason with the gasket provided.

Unless you have one of those plastic POS's with the o-ring, then god help you sir.
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Old 06-30-2010, 09:26 AM   #6
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Drain Gasket Leak


Thanks all...
the sink is on a bathroom vanity but they did not come together. I'll try the caulk and see what happens. Cheers
RT
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Old 12-28-2010, 08:06 PM   #7
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Drain Gasket Leak


Thanks for all the good advice. It was a relief just to know I was not the only person to struggle with a leaking lavatory drain! I removed the plumbers putty (which actually said on the tub not to use on marble, stone, cultured etc. - I'd failed to read that -,) used the recommended DAP Alex plus and pipe dope on the threads, let it set for a good two hours before filling the sink and dumping the water - no more leaks from the top! There was a drip from one side of the PVC trap - I put a generous amount of silicone on the threads and tightened it down - it's now dry. I'm a 74 year old DIY'r. My husband used to do everything, but he's now blind and can't anymore. Thanks so much for your help!
Sonia

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