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The fitting is good quality. I recently installed 4" PVC ducting (light wall) in my shop for dust collection. With a slight amount of sanding on the outside edge, the flared end of this fitting slides snuggly into a 4" PVC fitting and can be removed easily. If you find it slips on a dust flange, buff the inside of the flare with sand paper. This is a perfect interface between 4" PVC and 4" flexible hose.
It would be helpful if the interior of female portion of the item was made of a more flexible material so that a more secure connection could be made. Ideally you would have a rigid exterior and a softer interior.
The fit on most of my machines is not good. That has not been the case. I've gone back to taking 10 seconds and tightening the clamp each time I move to a different machine. I did that on my planer and it seemed to help. I was hoping that this would save some time by not having to attach clamps each time I switched to a different machine. The connector simply slips off after a few seconds. This wasn't worth the headache for me. I would reiterate what another reviewer said about wrapping the port with some duct tape.
This item works fine but my band saw has a cast metal saw dust port that is 4 inches so I had to add a piece of 4 inch pvc pipe to connect it to the reducer.
The quick connect is just what I needed to create my pre-collection filter on my dust collection system.
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