We always listen to customer feedback and continue to develop new solutions to improve dust collection. That is why we designed our new, patented 90-degree high-flow sweep elbows. Sweep elbows minimize flow restriction with ANY dust collection system that involves 90-degree turns. Dustopper setups that use one or more sweep elbows will have faster flow (more CFM) which translates to better separation and vacuum performance. Improves the performance of ANY cyclonic separator with a 2-1/2" port!  Our products are made and manufactured in Michigan, USA.