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Old 11-29-2010, 09:38 AM   #1
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Plumber's putty or glue?

I am installing a new lav sink in our bathroom, and I am wondering, do you use regular PVC cement or plumber's putty on the attachment of the black drain pipe and the bottom of the sink? The original one from Airstream was glued, but the place I got the sink from said that was wrong, it should have been installed with putty. Does it even matter?
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Old 11-29-2010, 09:46 AM   #2
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I have this sneakin' suspicion that Airstream was right to glue it in this case. The problem with plumber's putty is that, while it does well in residential applications, it wouldn't fare as well under conditions involving flex movement and vibration. But that's just my opinion.

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Old 11-29-2010, 09:49 AM   #3
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I wish you'd post a picture. In every land use sink I've installed, the basket in a kitchen and the pop-up in a lav sink is installed with plumber's putty. There's the danger that we're talking about two different things. That's where a picture would be helpful.

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Old 11-29-2010, 10:04 AM   #4
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Thanks so much for the quick replies! My camera battery is dead, but here is a picture of the sink and the drain pipe I'm referring to. The bottom of the sink has a small neck on which the flared end of the black tube slides over.
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Old 11-29-2010, 10:05 AM   #5
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The sink in my Excella has a chromed metal drain in the sink that attached to the black pipe, just like a home sink. I can't imagine what you would glue.

A photo would be a definite plus.

On edit, you posted a photo while I was writing, but it's really small. OK for the sink, but one of the drain large enough to see what it is might help.
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Old 11-29-2010, 10:15 AM   #6
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Quote:
Originally Posted by cathy624 View Post
Thanks so much for the quick replies! My camera battery is dead, but here is a picture of the sink and the drain pipe I'm referring to. The bottom of the sink has a small neck on which the flared end of the black tube slides over.
44430.jpg


If the stem goes down from the top, sits in the sink flange, and has a nut on the stem under the sink, I install those with plumber's putty, never glued. I can't see why that'd be glued. I'd just follow the sink manufacturer's installation instructions. If the manufacturer calls for glue, I'd glue it.

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Old 11-29-2010, 02:42 PM   #7
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This is a cheap sink w/o the chrome ring in the drain. This shows the bottom of the sink with the flared black tube coming off that. Then the threaded collar which attaches to the existing drain plumbing. My question is concerning the attachment of the white collar on the sink to the flared black tube.
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Old 11-29-2010, 03:21 PM   #8
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if the sink is plastic of some sort (or PVC like the pipe) the glue sorta kinda makes sense. Plumber's putty relies on gravity and the big lock nut. My 2005 Safari sink had the drain installed with plumber's putty - so much I must have taken a tablespoon out over the first week I owned it.

With the pipe on the outside, looks like gravity would hold it in place as long as the sink was bolted to the counter top. However you might create a waterfall in the cupboard if it wasn't glued - no way to use putty with that setup that I can see.

Rules of Plumbing from my two master plumber uncles (both named Paul):
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  • cold is on the right
  • payday is Friday
  • the boss is an S.O.B.
  • Sh** doesn't run uphill
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Old 11-29-2010, 03:34 PM   #9
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That photo helps a lot. What is the sink made of? It may be difficult to glue to the tube.

I think that I would use bath or automotive sealant rather than glue, they're practically glue anyway, so it could be removed sometime in the future if necessary without damaging the sink.

Some sealer on the male (sink) part and a hose clamp around the flared black tube ought to work.
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Old 11-29-2010, 04:27 PM   #10
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The label on plumbers putty warns not to use on plastic, at least the brand that ACE Hardware sells. I was going to use it recently when installing the lav in my Trade Wind but used a little silicone sealant instead with good results.
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Old 11-29-2010, 04:41 PM   #11
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Glue without a doubt!

My sink is very similar, I used glue because there is not a mechanical fastener that will hold it in place. Make sure you use glue for PVC.
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Old 11-29-2010, 05:13 PM   #12
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What is the sink made of?
"Plastic." The part/part description has no particular "plastic" specified. Not very helpful, is it.
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Old 11-29-2010, 06:33 PM   #13
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"Plastic." The part/part description has no particular "plastic" specified. Not very helpful, is it.
I hope that they didn't overly stress themselves with that description.

It is a nice looking sink, though. I'd do like I mentioned earlier, some bath sealer or silicone.

Now I am looking forward to the installed photos.
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Old 11-29-2010, 06:49 PM   #14
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I just installed the very same sink.
The black piece must be glued to the stub protruding from the bottom of the sink. It then slides into the p trap and is retained with the normal nut and compression/seal ring.
There will be nothing to keep it in place if it isn't glued. Just make sure the length is right with a dry fit before gluing.
I just used regular PVC primer and cement.
I also used a bead of clear silicone around the flange of the sink to seal and retain it to the counter top. After it cured I just trimmed the excess around the outer edge.
Very clean and stable install.
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