1. Please accurately measure the diameter and installation direction (counterclockwise) of your air - conditioning hose before purchase. Our mobile air - conditioning hoses have counterclockwise threads. There are two sizes with a diameter of 15 cm (from outer edge to outer edge). Please make an accurate measurement before purchase, so ensure it fits your air conditioner. 2. The exhaust hose is made of reinforced polypropylene with a high - quality steel ring inside. It is more stable than the hoses made of soft materials on the market and has excellent heat and corrosion resistance. It is a great alternative when the main exhaust hose of your mobile air conditioner is broken. 3. The mobile air - conditioning hose is telescopic. It can be shortened to 30/38 cm and extended to 150/200 cm, allowing the exhaust hose to be easily extended to fit anywhere you want, enabling flexible use at home or in the office. The expandable air - conditioning hose can adapt to any space. 4. Extend the purchased exhaust hose to the required length, then align it with the connecting pipe, lock it and rotate the hose counterclockwise to fix it. It is white in color. Weight: 900 grams. Size: 15 cm.