WARNING: PLEASE MEASURE YOUR AC HOSE BEFORE PURCHASE, not all brand of portable ac units have a universal size across models. Kraftex AC Hose. Our hose is shrinkable to 15" and extendable to 80" with a diameter of 5" and twists CLOCKWISE on to your AC. Our Air Conditioner Vent stops leaks and saves energy. It's extra-long length means that you'll never have to waste time AND money on putting two hoses together!. We are so confident in our AC Hose that if you’re feeling hot and bothered, we will FULLY REFUND you. So, click “Add To Cart” now and buy with confidence.