[UNIVERSAL DIA FOR 5.1inch/5.9inch] portable ac hose coupler can fit any 5.1inch hoses with inside diameter and 5.9inch hoses with outside diameter. You can even connect two hoses with different diameter together if Universal using for all 5.1inch/5.9inch hoses to extend the using length easily. [PREMIUM MATERIAL]This ac exhaust hose coupler is mainly made of plastic material, solid and reliable, because of its tenacity and flexible structure, its material has a certain heat resistance, good hardness can protect secure connection on both ends of the hose, and delay using the distance to provide good support. [USER FRIENDLY DESIGN] Our air conditioner exhaust hose connector is the best solution for extending your air conditioner hose. Enabling you to easily connect your exhaust hose/portable ac unit to a window/wall outlet. Suitable for 5.9inch portable air exhaust hose outlets. [GOOD SEALING EFFECT]The air conditioning hose coupler coupling extension features a tight seal, providing a tight and safe fit to the air conditioning unit tube to avoid any leakage or entry of insects and external debris, improving efficiency, saving power consumption, cooling or heating effect is more apparent.