Our AC exhaust vent has an clockwise thread direction so make sure to check this is correct for your AC before purchasing. The diameter of our AC hose is 5.9 inches which means it can fit most portable air conditioners on the market. Air Conditioning Hose is made of strong, flexible polypropylene which makes it long lasting - withstanding any wear and tear without leaking. Keep your portable air conditioner in EXCELLENT CONDITION with our AC hose. Keep the AC vent at its shortest length, 15 inches, or fully extend it to 80 inches. At home or in the office, our flexible, extendable air conditioning hose fits into any space. Extend the AC hose to meet up with the existing vent, line up the front of the hose and put on the unit specific coupler (sold separately, usually comes with AC unit). Turn CLOCKWISE until it snaps into place - its that simple. AC Hose Our hose is shrinkable to 15" and extendable to 80" with a diameter of 5.9" 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!