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 a/c unit, so that your air conditioning unit can be more efficient and cools your room at short time. High Quality: Made from plastic material. Durable and money-saving, can be used for a long time. Model: square + round Diameter: 15cm Material:plastic colour:Gray White Package Contents: 1 * 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.