How do I fit this sink? (with pics)

[DaveCWK]

Hi All,

I'm stumped I have this sink i'm looking to fit ontop of a 40mm thick worktop:







What's the usual way for securing something like this down? there's no fixings or anything on the reverse. Just the waste hole, and 2 small casting holes.

The waste fitting I have has a single black nut which I know you use to secure it directly to the sink to compress the seals etc.
Do I need to get from somewhere a 2nd, much larger diameter waste nut, to then bolt the assembled sink/waste down to the worktop? Because i'm not sure the waste threaded length would even be long enough to do that & still leave space to then screw on the Ubend part on the end.

I've never fitted a sink like this before & feel like i'm missing something fundamental

[SHutchinson]

I would use CT1 Power Grab 'n' Bond, rather than look for a mechanical solution.

[z4RRSchris]

you have a countertop sink, you glue them down.

ct1 will do, or any mould proof adhesive.

[Freakuk]

CT1 is your friend

[wolfracesonic]

Would a regular silicone be better than a grab adhesive? You’d have a chance to remove it if need ever arose, plus its own weight will help to keep it in position.

[andy43]

Big hole in the worktop, big enough to get something on that black nut later, and silicone to stick it down. Not too much - you ideally need to be able to run a blade under it to get it off the worktop if it cracks. Hardest bit will be sealing the back edge neatly if it’s not butted up against a splashback.

[reggie747]

You can buy a waste extension and has been said, CT1 it down in position.