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oh ok the photos do seem to confirm that.
My reason for doubting was that i'd seen the 'DA Only' stuff on weightweenies and other places, but my 6870 shifter seems to have 3 ports and I don't know why they wouldn't be functional. I would have preferred to use 3 separate wires rather than the Y Cable personally so it annoyed me.
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Because I'm not sure the R785 has 3-ports. That might be a DA update.
This says one: http://handsonbike.blogspot.co.uk/2015/08/introduction-to-shimano-road-hydraulic.html