4" diameter clothes dryer transition duct Includes supurr vent louvered vent hood with pipe and collar, supurr-flex UL listed clothes dryer transititon duct and two 4" plastic clamps Fire resistant, flexible and easy to install Durable, weather resistant hood Supurr-vent hood louvers operate quietly for maximum exhaust air flow and seals when not in operation to help prevent back drafts Kit Includes Hood, Pipe, Collar, 8-Feet Ul Listed 2158a Duct and Clamps Deflector Deflector SK8WFW 8-Feet Super-flex Dryer Vent Kit.