Secure washer: Flexible rubber connectors better closure than standard fittings, reducing heat loss and outside odors or small creatures from entering Three Complete Sets with All Components: This dryer vent package includes three full configurations (Set 13, Set 14, Set 15) with essential parts: 2 flexible connectors, 2 metal clamps, a 4 inch auto closing vent, and a 2.5 Meter hose (black PVC, gray HDPE, or aluminum foil Firm Clamp Connection: Heavy duty metal clamps secure tight attachment between hoses and vents, avoiding shifting or gaps during operations Common Fit for Various Uses: Features a standard 4 inch diameter that works with most dryer brands, dehumidifiers, and exhaust systems Easy Tool Assembly: Simple setup without tools, adhesives, or drilling required