Adding access point to cast iron svp

[Chris S]

I'm looking for a retrofit access saddle for a cast iron soil pipe but I'm not having any luck. Does anyone know of any such product? It would be installed above the spill over level (i.e. above upstairs loo).

 

Or is there a suitable adhedive available to install one intended for upvc e.g. the polypipe SA44B?

 

It is to add access to our neighbour's soil stack as we are building over their existing rodding access (manhole cover in our garden) and want to have an option available that doesn't involve replacing the whole stack!

 

Annoyingly their builder didn't add this access point even though their architect stated it on their drawing when they extended last year.

 

Thank you in advance

[Chris S]

I should add that it is an internal soil stack, which is boxed in. Thankfully their baththroom decor is quite tired and basic and the boxing is covered in plain white tiles so fairly easy to put right after the work.