This kit includes everything you need for installing your dryer to the BetterVent Indoor Dryer Vent with no tools or clamps required. Just pre-assemble the 90 elbow, 4" transition hose, and straight piece. Attach it to the back of your dryer and to the BetterVent Indoor Dryer Vent and it’s all set for use. Provides a top-quality product for anyone in need of dryer connections. Best choice for simplicity and durability. The flexibility of this connector for dryer allows the pieces to fit properly together as well as hug the wall once the appliance is pushed against it. This kit is 8 x 4 x 5 inches and gives a strong connection without creating a bulky mess behind your clothes dryer. Made in USA by Ziggurat Products.