【WARM TIPS】The diameter of our hose is 5.9 inch/15 cm (from outer edge to outer edge). And it has a counterclockwise threading direction. Please double check the diameter and screw direction before purchase. (NOTE: For Extension, make sure your original hose is counterclockwise thread. For Replacement, NO need to check clockwise or counterclockwise thread.)【Durable And Sturdy】The hose is made of strong, environment friendly polypropylene with good flexibility, which makes it long lasting - withstanding any wear and tear without leaking. Also built-in steel wire for reinforcement, keep your portable air conditioner in excellent condition with our AC hose.【Stretch And Shrink Freely】The hose is extendable. The shortened length is 11 inch/28cm, and i.