The rockler dustright is 2.5 inch. I bought the Onieda super dust deputy with 30 gal bucket at woodcraft for $215.00. it works great. I have a jet dc1100 and no dust gets into the jet bag. I had a 30 gal trash can seperator before and it worked but dust still got in the jet bag. The Onieda makes 6,5 and 4 inch inlets. Dust collection is about air volume. Don't restrict yourself below 4 star inches.