Different Type: The air-conditioning exhaust hose fitting has 2 types, round and rectangular, that is designed for different connection part of your portable air conditioner, so please kindly make sure the one that is needed. Convenience: The air-conditioning exhaust hose connector is simply designed and can be easily installed and used by us, so we can spend less time installing the item, which is labor-saving. Fine Replacement: The portable air-conditioner exhaust hose connector is a fine replacing when the old one gets broken after long time using and the durability and the sturdiness of it allows us to use the connector with less worry. Fitting: The size of the portable air conditioner exhaust hose adapter is about 15x15cm/5.91x5.91inch, so please make sure the interface will fit your portable air-conditioner or the exhaust pipe before purchasing. Firm: The portable air conditioner exhaust hose adapter is made of firm, sturdy and plastic, which is not easy to break and can provide you with stable connection with exhaust pipe, which is a good to make.