Fits all 5.9 inch to 6 inch hoses: Compatible with the back of many portable air conditioner units. Designed to fit down to 5.9 inch diameter exhaust hoses. Works with both clockwise and counterclockwise hoses. Easy to Use: No tools required. No drilling needed. Connects directly to the exhaust hose and installs easily on the back of the portable air conditioner. Enhance Cooling: This adapter secures the exhaust hose tightly to your air conditioning unit, improving efficiency and helping cool your room faster. High Quality: Made from durable plastic material. Built to last and provide long-term performance. Model: Square + Round Diameter: 15 cm Material: Plastic Color: Gray White Package Contents: 1 x Interface Note: The package includes only the items listed above. Other products are not included. Lighting and monitor settings may cause slight color variations between the image and the actual product. Measurement may vary by up to 1-3 cm due to manual checking.