I've never seen this before, where a 4" soil pipe must have been factory made.
This was fitted into a 1960/70s council house.
Sorry the photos are poor, too many cobwebs etc.
Vertical pipe on left with 4" emerging to right
Shows another 2" pipe emerging and heading off in the same direction as other horiz 4" pipe.
Even into the 1960s, the building industry was suffering from shortages of materials as a direct result of post-war rebuilding. That resulted in quite a few innovative techniques being tried, some successful, some not. Building a lot of identical houses would be the ideal place to try factory pre-assembly and welded steel pipes would need less material than traditional cast iron.
It could also have been welded on site then taken for hot dipping
NT
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