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Discuss Sink waste pipe unable to get water tight in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Shade007

Messages
5
Hi,

Noticed a leak in my sink and the pipe collapsed down for the P trap. So I was going to replace it all. However, i've been stuck because this starting part from the sink isn't forming a good water tight seal. The rest of the pipes kind of insert into each other nicel and have a grove in the inside. But this particular part does not. Can anyone offer some advice on how to fix this please. I am in the UK, if that is relevant to standards etc.

Regards.
 

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Undertrained

Plumber
Gas Engineer
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1,551
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It’s a different size to the McAlpine one, probably better replacing that too.
 

Shade007

Messages
5
It’s a different size to the McAlpine one, probably better replacing that too.
The elbow joint one? How would I go about doing that? Thanks.

Also the original one just seemed to have a lip to hit that original drop down elbow joint, so it does seem completely different type but it does seem to be the same 'size' but lack compatibility with the mcalpine and the flopast ones I have been getting.
 

Undertrained

Plumber
Gas Engineer
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1,551
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I can’t see the full setup, so I’d say a p trap, wm2 trap, or bowl and half.
 

Shade007

Messages
5
Use a mcalpine t12af
Unfortunately it didn't seem to work for me neither (well, be water tight). I have got it though and shown it in the video in the original post

I can’t see the full setup, so I’d say a p trap, wm2 trap, or bowl and half.

This is the full setup (and spares / combinations I bought) and clarification on the original lip for the connection that was installed and having to use temporarily until I find a new way.
 

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Last edited:

Undertrained

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Gas Engineer
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Sorty, I meant under the sink, including where the existing piece is connected onto the sink waste. I also don’t see the one Shaun referenced either, there’s one similar, but not the same McAlpine T12 a-f
 
Last edited:

Ben-gee

Esteemed
Plumber
Messages
2,416
If the threads are the same, you can offer it up - wrap the whole mating area in a couple of turns of ptfe and then continue the ptfe a few turns around the threads and do up the nut.
This can be made watertight, only trouble is it has to be repeated each time the thing needs undoing in the future( not often).

However, as you have bought new bits i would just remake the whole thing using mcalpine- if that non-compatible part you show at the beginning is the actual waste fitting itself? Change that as well.
A lot of kitchen sinks come with a pack of awful euro fittings - many experienced plumbers will bin this on day one and go buy some trusted McAlpine fittings, customers often query this , but it doesn’t half save a lot of grief!!
 

Shade007

Messages
5
Thanks Undertrained. I did actually buy this from toolstation mcalpine-bsp-coupling-flush-spigot/p78320 but it does seem instead of a T12A-F as described on the website, they actually gave me a T12A-2 so having to flip it now.

I shall try this path first.

If the threads are the same, you can offer it up - wrap the whole mating area in a couple of turns of ptfe and then continue the ptfe a few turns around the threads and do up the nut.
This can be made watertight, only trouble is it has to be repeated each time the thing needs undoing in the future( not often).

However, as you have bought new bits i would just remake the whole thing using mcalpine- if that non-compatible part you show at the beginning is the actual waste fitting itself? Change that as well.
A lot of kitchen sinks come with a pack of awful euro fittings - many experienced plumbers will bin this on day one and go buy some trusted McAlpine fittings, customers often query this , but it doesn’t half save a lot of grief!!

I certainly agree, I just didn't want to accidentally cause any more damage. I will try out swapping from toolstation who gave me the wrong one first.
 
Last edited:

Shade007

Messages
5
Thanks Undertrained. I did actually buy this from toolstation mcalpine-bsp-coupling-flush-spigot/p78320 but it does seem instead of a T12A-F as described on the website, they actually gave me a T12A-2 so having to flip it now.

I shall try this path first.



I certainly agree, I just didn't want to accidentally cause any more damage. I will try out swapping from toolstation who gave me the wrong one first.

Just wish to confirm, all is sorted. T12A-F as expected works brilliant. Thanks Undertrained. Double checked the manufacturers website against the code on toolstation, looks like they just picked the wrong one from the shelf and me not being confident in what I bought, just thought I bought the wrong thing.

Also bought from PTFE tape in case of further issues so thanks for that suggestion Ben-Gee
 

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