Question about RTO W/ Overflow Chrome 1 5/8" Vessel Sink Pop-up Drain

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Pegasus Push Button Vessel Sink Drain with overflow

I purchased two vitrous china vessel sinks with overflow hole. I then purchased two each Pegasus Push button drains with overflow
( 241 405 ). Because of the overflow feature, and the accompanying sketch and instructions, I am at a loss to figure out how the manufacturer expects to seal for leaks.I am planning on placing the vessel sink( which has a mounting flange about 6" in diameter ) on top of my new granite countertop. The sketch shows the draing being installed with an "O' ring under the top mounting flange . Then the drain is placed into the hole and an "O" ring and flange nut are tightened on the BOTTOM side of the granite countertop. This leaves the MATING surface of the sink and the countertop unsealed.Since the overflow side hole in the drain fitting allows water too be present between the outside surface of the drain fitting and the inner surface of the holes in the sink and the countertop to be only restricted by the lower "O" ring and gland nut, which I believe will be an area to create a leak. THE MANUFACTURER DOES NOT ADDRESS THIS! Am I missing something? Should the countertop installer have drilled a hole in the countertop large enough to allow the drain to be pre-assembled to the sink and then dropped throught the countertop hole, which would leave only sealant under the sink mounting flange to secure the sink to the countertop?

I would appreciate "insider" info on how to properly install these sinks.

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  • 2 more comments 
  • jokawa Feb 21, 2009

    What about the mating surface between the countertop and the sink? Should I put plumbers puutey there as well since the water will make contact with that area?

  • John Robinson Apr 01, 2009

    Same problem. Vessel to chrome mounting ring with rubber gasket between. Then directions have you place the polished chrome side down on the granite top, no gasket or sealer of any kind. Makes no sense. The overflow drain basically uses the space between the drain pipe and the hole in the granite as a water bowl for the overflow to spill into until it finds its way into the 2 holes. All the water never gets out of here (holes are too high) and the water then seeps out onto the counter under the vessel.
    Underneath the counter is even worse leaking between the rubber gasket and the bottom of the granite.
    It seems that some other gaskets should have been thought of for this installation.
    Does anybody have a fix??

  • Anonymous Apr 22, 2009

    My sink leaks from these oval holes in the side of the drain. Bad design.

  • John Robinson May 11, 2010

    I can not get putty everywhere but will try some and return.


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Put plumbers putty around the flange that will be in contact with the sink. When you put it into the hole, try to line up the overflow as good as possible. The nut that goes onto the bottom (tailpiece) has a rubber gasket that will go between the nut & the sink. Adding some plumbers putty here won't hurt. After all is secure, just remove the putty that squeezed out from tightening.

Posted on Feb 21, 2009

  • David Shaub Feb 24, 2009

    Anywhere you have a sink to counter or drain to sink or tub, you should use plumbers putty. Don't try using caulk, it will fail. The plumbers putty will seal and stay sealed for 30-40 years. After that, it won't fail, the sink will probably be replaced.


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