Well your plumbing is basically just a representation. In reality it will be much more complex (well, at least most are). Besides all the in-tank plumbing thats omitted, you have just a simplistic line representing the drain and return line. The specifics will be various fittings and sizes, etc. What about check valves, unions, and ball / gate valves? What size and type of bulkheads will be used (thread/slip). Any inline components that you need to consider? If your trying to reduce bubbles/splashing in the sump a tee can help by running the drain into the middle, with the water exiting out the bottom and air bubbles rising up to the top which is capped and only a small vent hole. Thats what I did, but I suppose that depends on how much flow your talking about, I've got ~1500gph going through the sump and without a lot of tweaking it sounded and looked like a Jacuzzi.