Small end fits a 4" dust hose but not without some serious work. It's so tight that I tapered the end and put some lube on it to avoid damaging the hose by pulling over the narrow end. The large end also fits freely into the end of the PVC pipe. To prevent leaks, I wrapped the end with duct tape a few turns and then sealed it. Had to do this because you obviously can't stretch the PVC pipe over the black adapter.
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