[bif24701]

If you already have the all the hoses and fittings use it. You should be fine. A 3/4" drain at full siphon will have enough capacity to keep up with your return. Not to mention you have 3 drains..... Yes it reduces flow but for your drain, not a concern. You return line is a different story, you do want to reduce the number and type of fittings you use.