Adjustable length is more flexible at home or in the office, extendable air conditioning hose fits into any space. The air conditioning hose is made of strong, flexible polypropylene which makes it long lasting. It can withstanding any wear and tear without leaking, keeping your portable air conditioner in excellent condition. The diameter of our hose is 5.1/5.9 inches which means it can fit most portable air conditioners on the market including for Frigidaire/Whynter,/SPT/Honeywell/Haier/Emerson/Newair, etc. The AC exhaust vent has a counterclockwise thread direction so make sure to check this is correct for your ac before purchasing.Extending the AC hose to meet up with the existing vent, line up both ends and turn counterclockwise until it snaps into place which is that simple.