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Old 03-12-2018, 09:45 PM   #1
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P trap to wall


I just replaced my bathroom sink faucet and pop up drain. In going to reconnect the p trap to the wall drain, I'm experiencing leaks. Not from any of the pipes coming down but from the horizontal wall connection. I replaced the coupler and ptrap to make sure it wasn't a bad gasket or something but still not sure what's causing it. The pipe coming from the wall isn't threaded so my guess is it's at a slight angle and causing a problem. How can I seal this? Simple as caulk? Picture is below.

Thanks!P trap to wall-img_20180312_224339_01_1520909056112.jpg
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Old 03-12-2018, 10:56 PM   #2
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Re: P trap to wall


Sure you already know that is not plumbed right to begin with, Would have to remove the trim ring to see for the proper fix.

But if that is what you had before and are ok with it. Just buy some Teflon Pipe Paste. Apply a good coat all round the joints where ever a washer is and on the washer also.
This will work most of the time depending how bad the joints are out of line.

Never hurts to add a little paste to the threaded joints. Especially with PVC pipes. Stops the nut from loosening over time from expansion with hot water.
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Old 03-13-2018, 05:43 PM   #3
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Re: P trap to wall


Did your coupling have rubber gaskets. If so put some meat on them and tighten with a channel lock.
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Old 03-14-2018, 07:32 AM   #4
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Re: P trap to wall


RRH, thank you for the information, I didn't notice anything wrong specifically with the plumbing but I don't know what I'm looking at either. I actually did remove and replace the trim piece, it looked the same (a pipe going into the wall) and it was patched with spackle around it. It seems the plumber's paste is the best option, it is only about .125" out of line.

Ghostmaker - yes the cuple had gaskets on each end. The ones I pulled off of their were flat grey foam-like washers. The new gaskets are translucent plastic, and almost cone-shaped (I think these are compression gaskets?). Is there a reason I should use one over the other? The pipe is made of bronze metal. Also, when you say put some "meat" on there are referring to the plumber's putty or something else?

I appreciate the help guys, looking forward to getting my sink back.
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Old 03-14-2018, 08:32 AM   #5
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Re: P trap to wall


Which joint is the leak occurring at?
What kind of pipe is the pipe coming out of the wall?
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Old 03-14-2018, 09:42 AM   #6
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Re: P trap to wall


The leak is occuring at the joint nearest the wall, at the coupler connection. As far as I can tell the pipe coming out of the wall is a bronze pipe, same as the coupler and ptrap I got. I measured the OD of the pipe coming out of the wall at 1.2525" and the ID at 1.795" with my calipers.
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Old 03-14-2018, 12:58 PM   #7
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Re: P trap to wall


Following for the wisdom of HK
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Old 03-14-2018, 01:37 PM   #8
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Re: P trap to wall


The pipe out of the wall receives a trap adapter, not the coupling. It has female threads on one end and male on the other. I have never seen a set up like that before so not sure what is going on there.
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Old 03-14-2018, 02:51 PM   #9
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Re: P trap to wall


CT - the coupling actually came with the ptrap, and the same one was already there so I just assumed it was standard.
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Old 03-14-2018, 02:56 PM   #10
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Re: P trap to wall


I agree CT. I assumed the set up was rigged for a reason with a slip joint compression fitting.
If the op bought a standard trap set up:..

https://www.homedepot.com/p/Eastman-...5099/205807786

...it would probably solve his problem. I assume that is why HK asked the OP what he had coming out of the wall.
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Old 03-14-2018, 03:57 PM   #11
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Re: P trap to wall


The guy's original plumbing has a lead solder collar in the wall. This was common in older plumbing from the cast iron threaded pipe days. What he did is a cheap fix as long as the pipe in the wall is not leaking. A professional would have cut and peeled the solder collar and adapted to a threaded plastic fitting and repiped it.
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Please use the rubber seals on both ends of your chrome coupling. Would it be correct to say your dripping from the coupling end itself? If so by meat I mean use muscle on it and tighten both ends firmly.
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Old 03-14-2018, 06:47 PM   #12
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Re: P trap to wall


I don't understand.
Quote:
I measured the OD of the pipe coming out of the wall at 1.2525" and the ID at 1.795" with my calipers.
How can the outside of the pipe be smaller than the inside of the pipe?

I downloaded your picture and blew it up as much as possible. It sure looks like galvanized pipe to me.

Is the end of the pipe coming out of the wall threaded?

If the end of the pipe coming out of the wall is threaded, will one of the coupling nuts screw on to it? (The one that connects the trap to the trap arm)
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Old 03-14-2018, 08:33 PM   #13
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Re: P trap to wall


Quote:
Originally Posted by hkstroud View Post
I don't understand.
How can the outside of the pipe be smaller than the inside of the pipe?

I downloaded your picture and blew it up as much as possible. It sure looks like galvanized pipe to me.

Is the end of the pipe coming out of the wall threaded?

If the end of the pipe coming out of the wall is threaded, will one of the coupling nuts screw on to it? (The one that connects the trap to the trap arm)
If the pipe coming out of the wall was galvy pipe the tubular coupling would not fit.

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Old 03-14-2018, 10:11 PM   #14
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Re: P trap to wall


Unless he wants to take on a larger job and go into the wall.

You either have to get what you have to work with washers and plumbers paste or go with a fernco coupling.

Not a lot of other options.
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