Universal Compatibility: This exhaust hose is suitable for all kinds of portable air conditioners that use 5.9inch/15cm outer diameter hose and thread counterclockwise. Adjustable Hose: This AC hose has good telescopic function and flexibility. The shortened length of the hose is 11 inches and can be extended to a maximum length of 59 inches. You can adjust this flexible, retractable air conditioner hose to your home or office. Sturdy and Durable: The air conditioner hose is made of strong and flexible polypropylene, which is very durable and prevents the air conditioner from leaking when the vent hose breaks. Easy to Install: Fully unfold the end of the hose, align the coupler, turn the coupler counterclockwise to screw on. 5.9" & Counterclockwise: This AC hose is threaded counterclockwise and has a diameter of 5.9"/15cm (rim to rim).