Belfast sink - joining old waste to new 40mm trap and pipe

[ShaunCorbs]

Won’t fit as the Belfast sink is flat faced

 

[Basher]

As per Shaun
Would only seal if you could fit additional washer(s) so that ring of plastic didn't touch the flat face of the belfast waste.
It's the same fundamental problem you raised originally, only a recessed washer instead of an o-ring!

And my tongue-in-cheek suggestion above is a bodge

 

[Plumb Line]

Aha, I didn't think of that and really appreciate you guys pointing it out. Thank you. I did try it with a bucket beneath and all seemed well, perhaps because gravity is on its side. But I think it is worth doing once and properly so I'll stick with using the McAlpine T12A-F.

Once I've got that, I'm wondering what the best way would be to connect to my existing pipework. In the correct order from the plug hole, I'm thinking:

1. The McAlpine T12A-F
2. A telescopic P trap, as there's a shortfall in the height.
3. Cut the end of the existing pipework (the horizontal bit on the solvent weld section) to whatever's needed to get the correct position under the sink's waste.

Does that all sound good?

One problem though... The sink waste is 1 1/2"/40mm. The existing pipework is 32mm. Where would be the best place to use a reducer and what type of reducer? The plumber left a reducer piece here, but I can't for the life of me see how to use it properly for a good seal. And I'm not certain if it's the best solution or not... I was wondering about one of these:

https://www.NoLinkingToThis/p/mcalpine-st28m-straight-connector-white-32mm-x-40mm/95260

And perhaps if that can go directly after the T12A-F? Then I can use a 32mm trap instead (the one the plumber left is 40mm) and may not even need the adjustable trap if the reducer drops me to the correct height.

That's just me thinking aloud though and not really knowing anything! So any thoughts from the experts are most welcome please. Pics below to help make sense of my gibberish. But happy to take more as needed.

Cheers

 

[ShaunCorbs]

telescopic p trap should work

 

[Plumb Line]

Great, that's good to hear, although I'm still unclear as to where the best place is to reduce.

But the plot thickens...! I haven't ruled out any of the above potential plans, but I am also wondering whether I should just start again with new everything from the toilet itself.

I'm still struggling to get my head around sizes and compatibility. I've removed the bend where it fits to the toilet - see the photo below. The outer threaded section of the piece in the photo measures around 47.5mm, the outer section above the threaded part (i.e. right at the lip) is around 45mm, and the inner diameter is 41.8mm. So what size is that piece compatible with? If it's compatible with 40mm wastes/pipes/fittings, then I might start afresh from there and no reducer will be necessary anywhere. At least I don't think it will! Obviously everything will be a bit chunkier but hey ho, at least it will be right.

Thanks to anyone who's sticking with me through this and sorry for making something complicated out of something which is probably very simply for those who know!

 

[ShaunCorbs]

Picture of the pan from the right hand side please

 

[Plumb Line]

Picture of the pan from the right hand side please

Sure thing. Is this what you mean:



Many thanks

 

[ShaunCorbs]

90° Bend Adjustable Length Extended Inlet Rigid WC Connector | McAlpine Plumbing

Achieve a perfect fit with the 90° Bend Adjustable Length Extended Inlet Rigid WC Connector, ensuring flexibility for various toilet installations.

mcalpineplumbing.com

Boss Pipe for use with WC Connectors | McAlpine Plumbing

Achieve versatile connections with the Boss Pipe, designed for use with WC Connectors for efficient plumbing installations.

mcalpineplumbing.com

 

[Plumb Line]

Thank you for the links. Is that to say the existing WC connectors are no good and/or the wrong size? I would rather not replace them unless it is necessary to be honest.

Is the "1½" Universal Vent Boss" on the second link likely to be a different size to the one on my existing WC connector?

Thanks again for your help

 

[ShaunCorbs]

Correct

Your current one is for an 11/4 connection you won’t get an adapter to 11/2