tubing is minimal, but you will need a slip to barb adapter to connect it to your 3/4" input and about 2 inches of tubing, and a pair of hose clamps. what you need on the discharge ports depends on what you are doing with it. in my application, i used just enough tubing to butt together the scwd and the barb adapter to minimize room for light to get in and let algae grow.
plan to remove the scwd from whatever setup you have it in every couple months to clean it out and keep it from getting gummed up... so don't plumb it in in a way you will not be able to get back at it later.