Deflecto Supurr Flex Dryer Transition Duct Kit, Flexible Aluminum Duct, 4" x 8' (HUPK8F) 4" diameter dryer transition duct Includes supurr flex UL listed clothes dryer transition duct, 2 hooker upper protectors and 1 gasket Easily attaches one end of the duct to dryer and other end to dryer vent Protects duct from being smashed behind dryer which can cause unsafe dryer operation and longer drying times No clamps, no tools, no tape. Gasket may be needed for proper fit on some dryers