Product review (5 stars): For Best Results Use a Semi-rigid Dryer Duct and Sealant - No Screws Needed!
A five-star rating because: (1) the duct-to-wall connector is a perfect fit from the wall connector to the semi-rigid dryer duct (attached to the dryer's outlet), to the exhaust vent; and (2) for ease of installation. The tolerances of the connector are amazingly exact. Only one installation modification is required of the aluminum duct: prying out the rigid connector that normally goes into the through-the-wall exhaust vent (being careful not to distort the duct). This modification enables the bare end of the duct to be screwed into the detachable male part of the connector, allowing for an exceptional fit. I applied a silicone-based sealant to where the flange and the end that goes into the exhaust vent meet. The sealant adheres the female connector to the wall, seals off any air gaps and makes the use of screws unnecessary. (Photos: [1] the removed duct connector; and [2] the semi-rigid duct going into the wall connector.)