Check your local codes.

How would an over flow drain work if there is no overflow opening in the sink/

I'm confused with the answer...do I buy or not?

Ok thanks!!!!

I'm confused by the answer too. So my vessel sinks do not have overflow valves in them. Based on the comments above, I'm guessing I go with a drain stopper that does not have a built-in overflow either, correct?

Basically, if your basin has an overflow tube, use an overflow stopper.

I believe the question was about vessel sinks [and small wall mount sinks with no overflow] and the answer refers mainly to bathtubs and sink stoppers. Where the drain assembly [Nameeks SA400 and SA400L] can come with or without the little overflow hole in the drain, and the drain WITH the little overflow hole is less expensive, can it be used anyway where the vessel sink has no overflow [or small wall hung sink with no overflow]? Is there a problem in a case where SINK=NO OVERFLOW and DRAIN=OVERFLOW?

Hi there JP Geerlofs, I actually just installed something like this in my home... In my half-bath, I bought a small rectangular vanity with an attached sink that had no overflow valve in it. I then purchased a faucet from Amazon, which (unbeknownst to me) came with a drain stopper. I soon realized that the drain stopper was made with an overflow hole in the tube, so I told my hubs I was going to return it and get another one. But he told me it didn't matter and that it would still work. I wasn't so sure, but he was right (he loves to hear that!). He installed the faucet and drain stopper (with overflow) onto a sink that didn't have an overflow, and it works flawlessly. No leaks whatsoever...and it's been on there for over a month now and used regularly (10+ times a day).

Getting the right drain tube is important may be important when it comes to with/without overflow.

First, Fred S included some good images, but there is a problem. Bathtub 'lift bucket' explanation is incorrect. The lift bucket is not a solid cylinder and will allow water to pass through it, preventing an overflow IF the drain can handle the volume.

If you install an overflow drain in a sink without the overflow passage (no overflow valve in a sink), there will be a cavity that will hold junk between the overflow holes and the sink wall down to the lower seal. Cleaning/drain cleaning chemicals caught in that cavity may damage the sink material. I just removed one from a cultured marble sink where the lower seal mating surface was damaged and leaking. Only way to fix it is to load it up with sealant or change the 8' long all-in-one countertop and sink.

Finding a non-overflow drain with a lever stopper is the hard part. Most use the push-type or rubber stopper on a chain.

Hi,

I read some of the undermount bathroom sinks you wrote about, all of which are described.

I'll buy that bathroom sink, but I don't know which one is best for me.

If you could help or clear me a little, I would take a bathroom sink that is good in price, beautifully designed, and durable.

So will you help me? Please reply me soon, I am weating for you!

what happens if you have a sink with overflow, but a stopper without?

I have a vanity, cultured marble sink without an overflow. The prior drain assembly has overflow holes in it, but there was never a leak. The new Moen faucet only comes with assemblies WITH overflow. This, to me, is an unnecessary risk. And sure enough, after assembling, I cannot stop the leak at the nut. Putty at the gasket from the bottom side of the sink does not work.

For those looking for these hard-to-find Pop up drain assembly WITHOUT overflow, here's a link to Kingston Fauceture Pop up Drain assembly Without Overflow:

https://www.amazon.com/dp/B0019W1QTW?ref=ppx_yo2_dt_b_product_details&th=1

NOTE: I had to stop at the plumber supply to get an answer, and I'm still uneasy. This device comes with an interesting rubber, double-ring gasket that goes directly beneath the flange in the sink. I asked where to put the silicone sealant as the manufacture states to use, but instructions had no diagram or directions. The plumber supply guys said to use the silicone directly under the flange metal, thus it will sit on the very top of the rubber, double-ring gasket [See photo in link above]. I might add silicone to the bottom of this gasket, too, just to play it safe so no water leaks to the outside of the pipe.

Tamie Bittle's "hubs" (above) has the best answer by far. (Her husband's answer was to go ahead and use the overflow drain even if you don't have an overflow sink.) The only difference between the two drain assemblies is that one of them has a pipe with a couple of holes in it to receive overflow water from an overflow-type sink that has been filled too high. If you don't have an overflow sink, then there's no water to be received by those holes, so who cares. At worst, if you find it leaks a little, just wrap up the holes with a layer of Flex Seal tape, pressed deeply into the pipe's threads so that the collar nut can be threaded over it. Remember, there's no water pressure in a drainpipe, so it's not like you're trying to mend a hole in a supply line.

Just yesterday, I cleaned out the gunk in my bathroom drain and discovered that the drain was an overflow type, even though the sink had no overflow hole in it. It had been working fine for 8 years, and still is.

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The water from the faucet can get into the holes in the pipe and get stuck in the reservoir above the flange and below the holes in the pipe creating funk amd nasty smell. so yeah, its a problem with or without the overflow in the sink, at least it is for me.