Square to Round: Air hose fittings are round at one end and square at the other and can be installed on the back of many portable air conditioners. Rapid Heat Removal: This adapter tightly attaches the exhaust hose to your air conditioner exhaust, helping to quickly remove indoor heat. ABS Material: The exhaust hose connector is made of ABS material, which is light and strong, durable and flexible, and can be used for a long time. Low Wind Noise: This exhaust hose joint has low noise during operation, will not disturb your normal life and rest, and can be used with confidence. Easy Installation: The air conditioning exhaust hose connector adopts a thoughtful and practical universal thread design, which can be twisted clockwise or counterclockwise to connect, and there is no need to distinguish it when using it.