Can't do that right now, I don't have any metric fittings.. And I really don't see nor understand why there are two pipes anyway, each pipe is about 1.5 inch and the recommended flow is between 200 gph to 600 gph so one pipe is really all it needs to drain.
Currently in the process of getting a deltec as well. Was originally going for the ap701, but im limited with space. I have to go with the apf600 for my 90.
Are you not worried about a possible leak? Those skimmers can overflow given proper conditions (i.e. macro algae spawn, snail spawn, use of epoxy or glues...etc).