Toilet Waste Pipe Connection - 5" diameter where can I get a reducer?

[Fit4Purpose]

I've just removed my old cistern and toilet due to a worsening leak coming from the seal between the two. The seal had disintegrated as had the washers. Bolt threads rusted making it a joy to get the wingnuts off with reduced access. Anyway my question is about the waste pipe. There is a 90 degree elbow fitting at the back of the toilet that then fits into a pipe in the floor which is basically a branch off the soil stack. However I noticed that there was loads of what looked like putty squashed around the connection, which seems to have been used due to a mismatch in size. The receiving pipe in the floor is approx 5" in diameter which seems an odd size. When I fit the new toilet (or refit the old if I can clean it up), I would like to use a a correctly sized elbow connector. However everything seems to come up as 110mm or less. Am I missing something? Is there some sort of reducer I can fit so that a standard elbow will fit? Thanks for any advice in advance.

 

[CountryFan]

Can you post a photo of the soil pipe? Probably a 4” connection but make up the collar in putty/cement/sealant et al.

 

[amfisted]

I had a similar thing recently, replacing a pan connector that was sealed inside the floor-level soil pipe with what looked like putty. When I took the old connector away and fitted a modern flexi, the pipes fitted together perfectly without any sealant, so the putty may have been merely cosmetic.

 

[robinbanks]

Dig deeper, and you may find you're oooking at a 5 inch collar on a 4 inch pipe and the 4 inch starts further down than you can see, but in case it really is a 5 inch pipe all the way down..

Get a bit of 110 soil pipe (maybe out of a skip if you don't want to buy a length), cut some inch wide rings off the end of it, then cut them so they can be opened up like a C shape. Cut a 3 inch section off the 110 and snap the 1 inch C shapes progressively onto the middle of the 3inch to increase its diameter to roughly the diameter of the in-floor pipe, ensuring that the openings in the C shapes overlap each other.
Now place it into the floor pipe so it's flush, and silicone up the gap between the 110 and the 5 inch. Fit a flexible pan connector like normal after it's cured

Brown=new 110 with c rings of 110 around the middle
Red=silicone
Blue=existing 5 inch

 

[Fit4Purpose]

Ok, reading all the replies I think I understand a bit better. The 5" (measured at 125.5 mm internal) diameter is actually like a collar that stands proud of the floor by 60mm. At floor level it reduces to 90mm I.D.

So it is like a one piece stepped reducer, slightly chamfered at the step to 90mm.

 

[robinbanks]

Flexible pan connector should fit normally then, and whatever you want to do to to make it look tidy

 

[Fit4Purpose]

OK thanks. Sorry to ask one more question. As I mentioned when I removed the old connector there was putty like stuff filling the void around the it which, due to it being tacky, had all sorts of 'stuff' stuck to it (dust, small bits of paper, etc). It was unsightly and impossible to keep clean. Is there anything actually designed to fill this space around the connector, such as plastic shims? I realise that silicone sealant is a possibility but that then makes removing it tricky next time.

 

[Fit4Purpose]

Looks like there are various pipe gaskets that would probably work.

 

[robinbanks]

Not sure that silicone necessarily makes it tricky. If you're bothered fill the bulk of the space with expanding foam, wait till it's gone beyond tacky (ie it has skinned to the point it doesn't stick to you but its still malleable) and shape it (push it) so that there is maybe 5-10 mm needs filing, then fill with silicone. This way you don't end up with a huge collar of silicone to remove next time

Or, follow the earlier recommendation to make your own reducer and fit it so the entire pipe is notionally 4 inches, then just connect your pan connector

 

[lostinthelight]

I had what sounds like a similar scenario, I
cut the collar off and fitted a longer tail pan connector with a finned grommet inside the pipe
Similar to
Look at this product that I found on google.com https://g.co/kgs/dyZYirZ