Another question. Lot's of videos identify this as the Power Beyond port. Is this really a P and not a PB port?
I'm trying to make sure I understand your image here.
I have an L3902 and BH77 with rear remotes and trying to figure this out as well. This description makes sense, but which hose on the BH77 goes to the rear remote PB port and which one goes on the hose just removed from the rear remote PB port?