This is my newly designed cyclone designed for smaller dust collectors in the 500 to 1100 cfm range. It will, however, work fine with larger dust collectors by just using one of the 4 inch inlets on these dust collectors. On some larger dust collectors there are two 4 inch inlets and on some there are three 4 inch inlets. The top discharge on this unit is a 4 inch female tube. I include a plastic adaptor that slips in the top so you can easily connect a 4 inch flex hose if you are going ...