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Thread: Semi-recessed vessel sink - with overflow? Milforde Semi-Recessed Porcelain Sink

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    DIY Junior Member blecrone's Avatar
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    Default Semi-recessed vessel sink - with overflow? Milforde Semi-Recessed Porcelain Sink

    Recently purchased this vessel type sink: http://www.signaturehardware.com/product14433
    It is described as having an overflow hole, which it appears to have. The overflow hole leads to a "channel" within the wall of the sink which leads down to the drain hole in the bottom of the sink. However, on the very bottom of the sink there are two dime-sized hole (1 on either side of the drain hole) which allow any water entering the overflow hole to exit the overflow channel before reaching the drain. Am I supposed to plug these two holes with something and if so what? If I don't plug them, the overflow does not function as such. Or is the whole system only supposed to function as a venting system? Thanks in advance for any help.

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    DIY Junior Member blecrone's Avatar
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    Thanks. I think I'm not being clear enough. I understand how an overflow is supposed to work. However, in this case any water that enters the overflow won't ever reach the pop-up drain because there are two holes in the bottom of the sink where the water will exit before reaching the pop-up drain. I am supposed to plug these holes in order to have a functioning overflow, or is the overflow hole really just a vent hole only?

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    Forum Admin, Expert Plumber Terry's Avatar
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    I am supposed to plug these holes in order to have a functioning overflow, or is the overflow hole really just a vent hole only?
    If the lower part of the sink doesn't work with a pop-up, and they just daylight, (something I haven't seen yet) then they may in fact be vents.
    Sounds like a risky solution to the poor vessel draining issues.

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    Moderator & Master Plumber hj's Avatar
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    Are you sure the two holes are not just "vents" from the casting process. If they are in fact the outlet of the overflow opening, take the sink back and get one that is not defective. There is no way that any reputable manufacturer would create a sink where the overflow water drains out of those two holes into the sink cabinet, UNLESS, they also make some "proprietary" fitting that covers those two openings and directs the water into the central drain opening, in which case it should have come with the sink. One disturbing item is that NEITHER of the drains they show with the sink seems to have overflow openings, and in fact are specified as "ideal" for homemade sinks which would not have overflow passages.
    Last edited by hj; 11-26-2012 at 06:47 AM.
    Licensed residential and commercial plumber

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    DIY Junior Member blecrone's Avatar
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    Quote Originally Posted by hj View Post
    Are you sure the two holes are not just "vents" from the casting process.
    This was in fact my first thought when I unpackaged the sink, and I didn't really look at them that closely. It seems odd that they just happen to match up with the overflow channel, though.

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    Moderator & Master Plumber hj's Avatar
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    quote; It seems odd that they just happen to match up with the overflow channel, though

    Well, they may have needed them to 'shape" the overflow passages, then sealed them afterwards. Pour water through the overflows and see where it comes out, or blow into one of the holes and check where it goes.

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