Thermwell Frost King AC42H Gray Air Conditioner Weatherseal 1-1/4" x 1-1/4" x 42" NON Adhesive Foam Strip, specially designed to help reduces leaks, so there is no draft between the window and the air conditioner, allowing the unit to work better. This foam strip is easy to install, just cut to length, and press the foam in place to seal the gaps around the window air conditioner. Also use it in the space between the window panes, and helps prevent minor vibrations. Made in USA.