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      05-20-2013, 01:01 PM   #1
BanziBarn
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Plumbing question - kitchen sink

Hi Guys,

I noticed today that the sink waste pipe coming out of the wall of my house was not as flush to the wall as normal.

I was able to push it back in but that made me curious as to why I was able to move it. When I look under my sink there is no way that the waste pipe can move because it's connected to the U bend.

Therefore, there must be a join of two pipes in the wall - I presume the external pipe is bigger than the one coming from the sink, with the smaller one sitting inside the bigger one.....

So, my question is, should these two pipes be more securely connected or is is OK for the waste from the sink to simply be sitting inside the external pipe as long as there is enough of an overlap and a slight slope?

The wall has had a history of damp, which I thought was something else, but this has made me wonder!

Sorry, know nothing about plumbing!

Thanks in advance.
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      05-20-2013, 01:46 PM   #2
gaza01
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Should all really be sealed but im not sure i understand you. Can you post a pic of it?
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      05-20-2013, 01:52 PM   #3
BanziBarn
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Basically the outside part of the pipe moves in and out but nothing moves under the sink so it can't be a single length of pipe going through the wall.
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      05-20-2013, 01:59 PM   #4
gaza01
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Ok i get you know. Not sure if it meets regulations or not but provided the water isnt backing up then its ok. My choice would be to have it all sealed up though. To test it...fill the sink up then pull the plug and get yr head under there to see if any water is leaking out. If it is then get it seen to.
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      05-20-2013, 02:51 PM   #5
BanziBarn
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OK cool. No, there is no visible leaking so it's probably ok. I was just a bit worried about small amounts coming out and leaking into the wall.

Thanks for your reply.
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      05-20-2013, 03:12 PM   #6
gaza01
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No worries. Just keep an eye on it. Waste pipe comes in varying sizes from 40mm diameter down to about 32 i think. Maybe the newer installation didnt match the previous hence yr pipe in pipe situation
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      05-20-2013, 03:48 PM   #7
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You said the wall has history of damp...get it checked out .It should not be two pieces of pipe with a join in the cavity of the wall!!!!
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      05-20-2013, 05:08 PM   #8
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It should be relatively simple to switch it for a one piece pipe and put your mind at rest.

I'd go down that route rather than just leaving it (especially with the history of damp).

Good luck mate...
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      05-20-2013, 05:58 PM   #9
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Is it connected straight into the soil stack?
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      05-21-2013, 01:20 AM   #10
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Nope, out the wall and then straight into the gutter drain.....
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      05-21-2013, 01:21 AM   #11
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Quote:
Originally Posted by john-vfr View Post
You said the wall has history of damp...get it checked out .It should not be two pieces of pipe with a join in the cavity of the wall!!!!
OK, Yeah, think I will.... Thanks.
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      05-21-2013, 04:40 AM   #12
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no one seems to have mentioned these are push-on fittings . I take it as the pipe comes through the wall that it enters a 90deg. elbow. I would suggest that you are either pushing the outside elbow back onto the pipe, or internally the pipe is slipping back into the U bend.
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