Features: Exhaust hose for portable air conditioners for lengthening or extending. Made of polypropylene and steel wire. Perfect flexibility, durability and portability. The maximum length of this hose can be extended to 1500/2000/3000mm. Two tubes can be extended without the connector. If you need a longer length, you can purchase more than one to DIY. Opposite the notch of the two tubes, and then rotate according to the direction of the thread, you can assemble and connect easily.