How hard can it be to connect a toilet waste?

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Staffordshire
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Hi guys,

Thanks for your time and help.

Renovated my bathroom, last step is the toilet.

It's a 1940's house with a cast iron soil pipe. I cut this back so it's nearly flush with the wall. I've measured the pipe inside diameter and it's exactly 90mm.

You would think okay, buy a 90mm pan connecter and away you go but my concern is this. The 90mm pan connectors are 90mm to the rubber ribbed sections which bend back when pushed in to create the seal. With my pipe being exactly 90mm this won't happen and the seal won't be created.

What I'm proposing to do is buy a 90mm external, 84mm internal piece of pipe and insert this into the soil pipe, let's say 6-8 inches deep. Then I'll install the 90mm pan connector to this and being 84mm inside the ribbed sections will bend back to create the seal.

The only slight concern is the pipe coming out but being 6-8 inches in I can't see this happening.

Once this is fitted I'll then connected to the pan spigot.

Is this the correct method and will it work or is there another way around this?

Any advice appreciated guys.

Thanks!
 
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