Product review (1 stars): You had one job
As others have stated, the locking mechanism is terrible. One side locked better than the other, but still was barely strong enough to hold a few ounces of weight. I heated up the plastic and pushed the tabs out so the connection would be better, but it still wasn't anything I wanted to gamble a dryer vent on. On the receiving end of the dock, it appears that the groove was done by hand with a dremel or extremely poor machinery. The groove varied in size quite significantly. There is either a problem with quality control or the brains behind this company doesn't mind selling garbage.