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Author:
sum (FL)
I am installing a push up lavatory drain by Riobel, model number DB150. Here is the link to the drain and exploded parts diagram.
[houseofrohl.com]
[images.salsify.com]
Now, on the underside of the drain flange, there is an "upper gasket" that goes between the drain flange and the sink. The diagram stated that this gasket is only used when the drain opening is over 1-5/8".
My question is if you do use this gasket, will you use the sealant between gasket and sink, between drain flange and gasket, or both?
Finally, since it has an overflow, there needs to be watertight on the underside, and they call for (that's what I want to confirm) to have sealant on the threads as well as all the way around the inverted gasket. I have never had to do that the bottom just seal by compression of the gasket.
Is this sealant on the underside to the washer and threads really needed?
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Author:
george 7941 (Canada)
Yes, sealant is necessary if you want to be sure it is not going to leak.I have come across leaks past the threads because the installer did not use silicone on the threads. Sometimes the bottom surface of the sink at the drain opening is a little rough.
I always apply silicone to the threads where the nut is going to end up and I apply a light coating to the upper surface of the bottom rubber washer.
As for the top washer needing silicone, tough to say without actually seeing it. If the gasket is nice and pliable and fits the sink drain opening well, I will skip the silicone.
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Author:
sum (FL)
George, this will be the first time I use silicone on the underside of a sink.
A thought that comes to mind, if silicone is used on the threads and gasket under, that means you need to wait for the silicone to cure before testing for leaks, right? That means at least three hours even for those "rain ready in 3 hours" silicone?
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Author:
george 7941 (Canada)
No need to wait, I check for leaks as soon as I finish the installation.
This is a non-critical application of a sealer, most important fact being there is no pressure. Also water is a non-aggressive fluid, with no additives in it, unlike some other fluids e.g. axle oil in automotive applications.
Similar to ABS cement. I don't wait for full cure, I check for leaks on completion of the job.
You haven't kept up with advances in silicone technology. The advanced ones are now shower ready in 30 minutes, not three hours.
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