- - Our AC exhaust vent has an anti-clockwise thread direction so make sure to check this is correct for your AC before purchasing. The diameter of our AC hose is 5 inches which means it is most compatible with portable air conditioners on the market.- Kraftex 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, 59 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 ANTI-CLOCKWISE until it snaps into place - its that simple. Product Size:2 meters (78.7in) diameter 13cm (5.1in)2 meters (78.7in) diameter 15cm (5.9in)1.5m (59in) diameter 15cm (5.9in)1.5m (59in) diameter 13cm (5.1in)