Let The Hot Air Stays Outside: The window seal keeps the warm air coming from the hose of your portable air conditioner away by locking the hose between the window frame and the window itself, so you can stay cooler on hot days. Energy Saving And Emission Reduction: Air conditioning window seals designed with an adjustable coupler can prevent hot air from entering, help to cool, and improve air conditioning refrigeration performance. This reduces energy consumption and saves electricity bills. Universal: The air lock window seal kit is suitable for all portable air conditioners of manufacturers. Suitable for Top-Hung Roof Windows, Push Out Casement Windows, In-Swing Casement Windows. Fits the window with a maximum perimeter of 200CM(79 inches)/300 CM(118 inches). Reusable: The window seal for mobile air conditioning systems, waterproof, washable, lightweight, and easy to store. The window seal can be easily removed when not in use and used again next summer. Easy To Install: NO NEED FOR DRILLING HOLES. All your needs come with our window seal kit! Just apply the adhesive tape to the inside of your window frame and to the window itself. Attach the window seal to the tape. Then put your air conditioner hose through the coupler and tie tough, very simple!