Quick Connect & Disconnect: With its innovative twist-lock mechanism. Excellent for quick connect/disconnect of dryer vent hose. Easy to Install: simply screw the dryer vent hose connector onto the wall and the hose into the adapter, just twist and unlock and twist to lock back, made hooking up the vent easy. Fits 4 Inch Tubes. Flexible Dryer Vent Hose: Dryer duct hose is a flexible vent hose made of high quality flame retardant aluminum that measures 4inch (diameter) x 8 feet (length) when fully unfolded. you can install any 4inch vent pipe or 4inch flexible dryer hose. Perfect Connector:Fits 4 Inch Tubes. Works well for covering up a hole in the wall for the dryer vent. Makes the closet wall look clean and make your laundry room look professional finished. Abundant Applications: Suitable for residential air duct solutions; Widely used in bathroom venting, dryer ventilation, planting room, laundry room, laundry closet, table saw dust, wall exhaust vent, ceiling or warmhouse air circulation, etc.