MAIN PURPOSE: This window frame sealing cloth keeps hot air away from the house, whether it is hot air from outside or from a portable air conditioner. WITH COUPLER: This air conditioner sealing kit is designed with adjustable coupler for better sealing and less air convection, saving energy and electricity. WIDE APPLICATION: The window sealing kit is available for most portable air conditioners, for overhang dormer, roll out casement and casement window, etc. 210D POLYESTER: The sealing cloth is made of 210D polyester, which has good and can prevent rainwater from entering from the outside in rainy days. EASY TO INSTALL: Simply stick the tape to the inside of the window frame and to the window, attach the window seal to the hook tape, no drilling required.