About this item [NO DRILLING REQUIRED]: Portable, durable, quick and easy to install. No need to drill holes. [ WIDE COMPATIBILITY ] : Suitable for all portable air conditioners and dryers and compatible with most windows. [ FUNCTION ] : The window seal dissipates hot air from your room from the hose of your portable air conditioning unit by locking the hose between the window frame and the window sash. [ EASY TO INSTALL ] : Suitable for 15cm diameter exhaust hoses, easy to install at home or in RVs and other indoor/outdoor. [ STRONG COOLING PERFORMANCE ] : With this great idea, your room can be cooled in less time and the unit creates excellent cooling performance for you.