micro bore manifold

[Tiga]

Are there any manifolds that have feed and return pipes on the same unit?
Checking out a system that doesn't work well on an additional radiator, the feed and return pipes are both connected to a vertical copper manifold for micro bore pipes, it seems to have all the radiator pipes connected to this one manifold? can't find a picture of anything like this in supplyers catalogues so I'm wondering if the builder who fitted the extra radiator knew what he was up to? it's over 6m away on 15mm pipe then under floor for another 3m on micro bore.

Any links to pictures of manifolds or drawings would help.

Thanks

[DEEARR2]

Personally have not came across a dual manifold. I take there are both flow and return feed pipes from the boiler entring this manifold, 22 or 15mm.