Fits all 5.9 inch - 6 inch hoses: Fits on the back of many portable air conditioner units to fit down to 5.9 inch diameter exhaust hose. Fits both clockwise and counterclockwise hoses. Easy to Use: No tools needed. No drilling. Connected to the exhaust hose, and can be easily installed on the back of the portable air conditioner. Enhance Cooling: This adapter can attach exhaust hose closely on your air conditioning unit, so that your air conditioning unit can be more efficient and cools your room in a short time. High Quality: Made from plastic material. Durable and money-saving, can be used for a long time. Model: Round Diameter: 15cm Material: Plastic Color: Gray White Package Contents: 1 x Interface Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allows an error of +/- 1-3cm.