Toilet pan for soil pipe at 180mm - HELP (and a warning for others)

[BotusBuild]

I was thinking 2 x 45's, but then how to get that waste in is the issue, which I haven't figured out a solution yet apart from cut and glue (NO!) 

[Nickfromwales]

8 minutes ago, BotusBuild said:

I was thinking 2 x 45's, but then how to get that waste in is the issue, which I haven't figured out a solution yet apart from cut and glue (NO!) 

Just change the branch! You'll still pick the waste up exactly the same way.  

[Gone West]

10 hours ago, Nickfromwales said:

My only issue is, that is a T branch, and should be a Y branch like the other if poop is dropping into it from "Le Bog".

That's interesting, what is the reasoning behind having to use a Y instead of a swept T in that position.

[BotusBuild]

14 hours ago, Nickfromwales said:

Just change the branch! You'll still pick the waste up exactly the same way.  

 

Done. Frame time

 

Edited May 22 by BotusBuild

[BotusBuild]

I've started a topic HERE to cover GROHE frame install for others to reference.

[Nickfromwales]

53 minutes ago, BotusBuild said:

 

Done. Frame time

 

“By Jove, I think he’s got it!” 
 

🤝👍

[Nickfromwales]

5 hours ago, Gone West said:

That's interesting, what is the reasoning behind having to use a Y instead of a swept T in that position.

There’s not enough sweep, and there would be a lot of ‘matter’ going to the right as well as flowing away to the left. 
 

If a T is laid horizontally with a good fall then you can get away with it (just), but I avoid using them tbh.

 

Not such a worry if theres a flushing WC upstream, but here there’s just a 40mm waste which isn't sufficient to ‘move things along’ (if there are any stragglers ). 

[BotusBuild]

2 hours ago, Nickfromwales said:

40mm waste which isn't sufficient to ‘move things along’ (if there are any stragglers ). 

Not even if it a full flowing shower 😀 (statement, not question)

[BotusBuild]

Here is the frame fitted

 

Better explanation of the Grohe instructions HERE that I took to fit to this stage. That topic will be updated with the extra steps still required.

[Nickfromwales]

1 hour ago, BotusBuild said:

Here is the frame fitted

 

Better explanation of the Grohe instructions HERE that I took to fit to this stage. That topic will be updated with the extra steps still required.

Tres bien, Rodders.

 

@Gone West, you can see the difference in the two branches, with the above being so much better for 'flow'.

[BotusBuild]

Got the walls repaired, a backer panel fitted and the flusher panel on. Just awaiting the toilet pan tomorrow

[BotusBuild]

[crispy_wafer]

1 hour ago, BotusBuild said:

What have you used for the grey panel?

[Mr Punter]

I thought you were going wall hung, hence the frame?

[BotusBuild]

3 hours ago, Mr Punter said:

I thought you were going wall hung, hence the frame?

It is wall hung 🙂 

 

The photo doesn't show the gap between pan and floor 🙂 

Edited June 11 by BotusBuild

[BotusBuild]

7 hours ago, crispy_wafer said:

What have you used for the grey panel?

It was a left over side panel from the kitchen (Wickes)

[BotusBuild]

On 11/06/2026 at 18:15, BotusBuild said:

(Wickes)

Where the (bleep) did that come from? Obviously a brainfart on my part. It was Wren Kitchens 🙂 

[Nickfromwales]

Progress-is-a-making 🙂🫡

[MortarThePoint]

Late to the party on this one, but I have spent a long time muddling through pan connector heights.

 

I am guessing your original plan was to put a 90 swept bend into the swept tee and that would have made things too high. Or was it going to be a 90 degree pan connector straight into the soil pipe branch? Comfort height toilets can help, but not as much as 40mm I don't think.

 

I think swapping to a 45 degree branch is a good shout from the not blocking perspective, but also would have lowered where the bend would have ended up had you gone that route (image below). With either branch option, you could have rolled the branch about its axis and used a 45 degree bend instead of 90 at the cost of pushing the pan further into the room a bit. Some other options to have on the thread in case someone else gets stuck like this.

 

45degree options:

    SP163 https://www.floplast.co.uk/product/bend-1

    https://mcalpineplumbing.com/wc-connectors/rigid-wc-connectors/45-angle-rigid-wc-connector/

 

You can also get a tight radius 90 degree bend (OSMA 4S160B https://www.jewson.co.uk/p/osmasoil-pvc-u-spigot-bend-tight-radius-90-110mm-black-PO4S160B)

 

You've ended up with a really nice result though, so it's all worked out well.

 

Floplast parts shown (SP190, SP210, SP161).