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How to repair leaking sink drain?

What's going on here? This bathroom sink drain piping leaks where the arrow is pointing - as you'd expect since the corner pipe just slots into the next section with nothing to seal it. Seems like I need to replace at least that slighly darker section to the right of the arrow with something else.

FYI the piping is roughly 6cm diameter, apart from that fatter section (with the warning on it that I can't get a decent picture of so I don't know what it says).

PXL_20250130_052557044.RAW-01.COVER.jpg PXL_20250130_052605742.RAW-01.COVER.jpg

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EricL

Hello @daven25

Have you tried to track down the source of the leak? It could be the rubber O ring from the top fitting, but if it is not, it's possible the leak is coming from the elbow where it meets the grey PVC fitting. Are they glued together properly? I suggest using Protek 125ml Type N Blue Cement Solvent to join the pieces together. My only other thoughts are the elbow fitting could have a hidden crack on its body that you can't see.

If you mix a bit of food dye with water tip it into the sink and you'll be able to see where exactly the leak is coming from.

If you need further assistance, please let us know.

Eric

daven25

Thanks Eric,

A bit surprised. I was expecting to look for something like the screwable part at the next bend along where it turns downward, but I now realise all the other joints are just shunted together. So this is the norm? They're all glued/cemented?

Yes leak is at that joint where the arrow is.

EricL

Hello @daven25

I was observing the connections that were made and it appears that the leak only appears on that very join you've indicated. If it was just pushed in, then it's very likely to leak. But once you've glued that join together, it should stop the leak. Please note that the glue grabs instantly, and you'll have a second or less to adjust the position so make sure that it is already in the correct direction when you push it in.

Please make sure to wear personal protection such as gloves and goggles when working on your project.

If you need further assistance, please let us know.

Eric

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