Dundas Jafine TD48D2DZW Vents, 4-Inch Dryer to duct connector kit offers a safe and efficient way to connect your dryer transition duct to the back of your dryer Kit includes a ProFlex dryer transition duct a plastic connector piece as well as an extension piece for dryers with recessed exhaust ports Connector piece is made of UL94 rated; Flame-resistant plastic for a safe connection Protects the duct from being crushed and improves the air flow from the back of the dryer Connector piece is friction fit to the dryer for an easy connection that can be easily removed for cleaning