Features ABS PLASTIC: The hose coupler is made of excellent ABS, which has light weight and good toughness, wear and aging resistance, can be used for a long time without damage. MAIN PURPOSE: This exhaust adapter is mainly used to tightly connect the exhaust hose to the air conditioning unit to ensure efficient cooling of the room. SQUARE TO ROUND: The fitting adapter is square to round design, which can be easily installed on the back of the portable air conditioner without drilling holes. EASY INSTALLATION: This hose adapter is compact and easy to install without tools, tape or any other window air conditioner accessories, convenient and durable. APPLICABLE HOSE: Our square to round connector is suitable for 5.9in‑6in air conditioning exhaust hose, suitable for both clockwise and counterclockwise hoses. Specification: Item Type: Square to Round Hose Coupler Material: ABS Features: Fits all 5.9in-6in hose; fits the back of many portable air conditioners; fits from square to 5.9in diameter exhaust hoses; fits clockwise and counterclockwise hoses Package List: 1 x Exhaust Hose Coupler Package List 1 x Exhaust Hose Coupler