Description: Fits all 5.9"- 6" Hoses: Fits on the back of many portable Air Conditioner units. Fits both clockwise and counterclockwise hoses. No tools needed. No drilling. Connected to the exhaust hose, and can be easily installed on the back of the portable air conditioner. 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. Made of ABS material. Durable and money-saving, can be used for a long time. It can be applied to homes, offices, etc. Specification: Item name: Exhaust Hose Interface Material: ABS Square: 18 x 15 x6.3cm/7.1 x 5.9 x 2.5 inch Round: 15.5 x 4.3cm/6.1 x 1.7 inch Option: Square bottom/Round interface optional Application: Square bottom/Round: for 15cm diameter exhaust hose; Package Includes: 1x Exhaust Hose Interface Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you.