BigWallop wrote:

What size is the waste connection at the outlet for the kitchen system ? If
you have a 50mm out flow from the kitchen, then you can combine both the
bathroom and kitchen to the one outlet, and then cap the old bathroom waste
at the service duct. But this can only be done if the kitchen out flow is
50mm at the outlet to the main stack.

Why exactly? Is that a building regulations thing? If do it's
something I haven't spotted.

--
Chris Green )