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Hi @NomanRiaz,
Just to confirm, did you do the nut up by hand or use a tool? They typically need to be done up with a tool to compress the seals.
It's a bit odd that it would continue to leak. It sounds like it, but do you have one of the black seals on the waste within the bowl area and the second under the bowl in the cabinet area?
Could you please post an image from within the bowl and then another from under it in the cabinet area.
Mitchell
Thank Mitchell,
Yes, one black seal in the bowl and one underneath and i used multi grip pliers to tighten it.
The bottom seal deform a little when tighten, i tried adding silicon sealant at the bottom as well, but no effect.
Hi @NomanRiaz,
From the photo, it’s a little hard to tell, but it looks like the seal under the basin might not be compressing evenly, possibly due to the waste not sitting squarely in the hole. That washer on the bottom doesn’t appear to be bulging in the usual way from over-tightening — it almost looks like the nut is making full contact on the right-hand side but not on the left, which could be why the seal isn’t working.
Can you check whether the fitting is sitting flat in the basin waste hole? If it’s even slightly tilted, that can cause the lower washer to distort or fail to seal properly. Also, that small crack on the underside of the basin is worth double-checking — just to be sure the leak isn’t coming from there instead.
If the waste isn’t sitting square, loosening it off and carefully re-seating it with some silicone under the top flange might help. Let the silicone cure fully before running water to give it the best chance of forming a seal. If that still doesn’t resolve it, it may be worth trying a new rubber washer or replacing the unit if the thread or casting is uneven.
Just a quick note that since this involves plumbing work, it's important to remember that connecting a drain waste outlet to the home’s waste plumbing must be carried out by a licensed plumber. If you continue to struggle with seating the washer properly or can't fully tighten the fitting to create a reliable seal, I’d recommend enlisting the services of a plumber to complete the installation and ensure everything is compliant and watertight.
Mitchell
Just another pair of eyes @NomanRiaz - and I agree with @MitchellMc - it doesn't look centered.
Is there also a hairline crack? Is that 'droplet' from the crack or the seal - hard to tell.
