Product review (5 stars): Good for tricky and tight laundry closets
These worked well for creating an unobstructed path, as before my semi rigid ducting had to snake around and lint would build up. With 2 of these and some non expanded semi rigid ducting, clothes dry nearly twice as fast.

These are a bit better than the super low profile elbows as they do not reduce pressure as much.. and better than the larger stove pipe elbows that take up a lot of room.

The connectors fasten easily with other ducting that has this type of fastener/snap connectors. It is not hard to find semi rigid tubing that has male and female connectors already. Using stuff without the ends works, but not as well, as the connection is not as secure, and both ends connecting to it have to be male. It is best to install duct work so that the air flow has low resistance. The female end goes over the male dryer exhaust, and again, each section continues this pattern to the wall, which should be male ducting going into a female exhaust vent at the wall. If it does not fit, you can take some pliers and bend the ribbing inward a bit to make it fit.

I had some issues with the elbow falling off the dryer side. Foil tape did not help since the dryer is tapered/ribbed male, and the clamped female elbow slowly slides down. A simple fix was to bend the dryer's male vent in 4 spots with pliers so that the female end of the elbow would stay on well once the tension ring was fastened. I then taped over the seam with aluminum tape. Be sure not to use screws, as they will catch lint.