I needed something that would allow me to hook my dryer up to an oval dryer chute in my new house and this was the perfect conversion piece. I’m converting from a 4” round to a 4” oval. It took me less than 10 minutes to hook it up.
It fit and worked fine except the clamp was broken and had to get another at the hardware. But was still glad to have it since they are hard to find anywhere else.