Enhanced cooling: Round Tube Adapter for Air Conditioner connects tightly to the air conditioner, which helps to drain heat from the room quickly, and your air conditioner can cool the room more effectively in less time Perfect parts:Exhaust Duct Interface is able to replace your old and damaged parts,which perfectly fits the exhaust hose of portable air conditioner Wide compatibility:Air Conditioner Accessories are suitable for many portable air conditioning units,supporting clockwise and counterclockwise air conditioning hoses Material:Air Conditioner Exhaust Hose Connector made of environmental friendly ABS is and long-lasting,also lightweight,strong and flexible,working for a long time Easy to install:Air Conditioner Exhaust Hose Coupler is easy to install,no tools needed, no drilling required,which can be easily installed on the back of the portable air conditioner