This reducer in bathroom...?

[Phill]

Hi guys,

I will be doing a first install bath soon and wondering why this reducer is in place to the main waste stack in our upstairs bathroom?

The house is 1957 build and probably originally had a bath. When we moved in there was a shower in this location which had inlet and waste pumps. Pumps were knackered. I can't remember if anything was attached to this reducer when I pulled the shower out.

Also what pipework is needed to connect to this (main stack) from the bath's P trap?

Bath I'll be installing is below,

Thanks

,

 

[just pumps]

Looks as if the outlet pipe from the old removed pump connected there. Should be safe to remove it as long as there isnt a one way valve inside it.