I'm in the process of upgrading my utility room and small downstairs
toilet, which are part of a fairly recent extension. Currently the WC
sits directly on a multi-input waste menifold like this one:
The two basins concerned drain into 2 of the 40mm 'sockets'. It works
fine, but looks messy, and the manifold gets in the way of the new WC.
Are there any simple improvement to this arrangement, or is the only
alternative to install an additional connection to the drainage system
such as a back inlet gully?