I still can not find it, I need it for more info, also I am looking at using the parts in this pic (bad photoshop job) I think I t will allow the pipes to sit closer together than using a 180 degree bend or 2 90's, it uses a 45 "T" and and another 45 elbow. I think it will allow more pipe in a given area. but you would have to cap the ends of each 45 "T".
If I remember correctly this was just a cad type of drawing and they alternated the black and gray tanks to get them closer together. Sorry that I do not remember what thread it was I looked at so many this weekend I just can't remember which one