[Warm tip] The diameter of our hose is 5.9 inches / 15 cm (from outer edge to outer edge). And it has a counterclockwise thread direction. Please check the diameter and thread direction carefully before purchasing. (Note: For extensions, please ensure that your original hose has counterclockwise threads. For replacement, there is no need to check clockwise or counterclockwise threads.) Durable and strong] The hose is made from strong, environmentally friendly polypropylene that is flexible, making it durable - it will withstand any wear and tear without leaking. Also with built-in steel wire reinforcement, use our AC hoses to keep your portable air conditioner in great shape. [Free Retractable] The hose is retractable. Shortens to 32cm and can be extended to 59 inches/150cm. Easily extend the length of your exhaust hose to fit anywhere in your home or office. [Universal Compatibility] Perfect replacement for old or damaged portable AC vent hoses. Suitable for the most popular portable AC models using 5.9 inch diameter vents such as Honeywell, Black Decker, Whynter, LG, JHS, Haier, etc. [Easy Installation] Gently stretch the hose. Align one end with the window connector, then turn the connector counterclockwise to snap the hose in place. Then turn the hose counterclockwise to the hose connector or the vent on the air conditioner.