BigWallop wrote:

The stack above the branch for the WC might only be used as a vent, so check
that the branch and the spigot into the house isn't 110 mm (4'') before you go
buying the wrong sizes. It is common for this type of arrangement to be used is
nothing else is being connected above a ground floor loo. Does the stack also
take rain water from the roof ?

The stack just goes up to the roof line, diverts around the roof and
then vents to the air.


If it looks like a normal WC connector then the branch must be 110 mm (4'') or
nothing else of the modern type would fit it. If so, then you should be able to
fit two 90 degree elbow connectors into the system. The 90 degree elbows aren't
that wide on the spigot end and should take up only 100 mm or there abouts.

The branch on the soil pipe has 3 1/2 x 3 1/2 stamped on it.

There's a picture of it he

http://www.wanlockhead.org.uk/files/stack.jpg

and a picture of the pan connector he

http://www.wanlockhead.org.uk/files/connector.jpg

--
Steve Loft