Installing the NYOS is pretty easy........Just lift it into the sump, and job's done ! No tubing to connect to it. Just plug it in, and off you go. One thing I'll add is that in the information supplied with it, it tells you how to adjust the two 'screws' at the top of the two tubes at the back. One is a fine control for water, the other is the air intake control. The most important bit that they don't seem to mention is the long tube at the back (with the water fine tuning screw on top). You can turn this whole tube to adjust the level of the foam in the skimmer. Use this to get an approximate height for the foam, and the other two screws on the top are for fine tuning.
Oh, and when you put the NYOS together, go very easy when tightening up the screws. They don't have to be that tight, but too much pressure will crack the acrylic.