Clamp On Interior Vision Window remove
Description: Part Number: COV1A 
Satin Anodized Aluminum Clamp-On Frame Interior Glazed Vision Window
Clamp-On Style Vision Window Frame Easily Clamps on to Wall Opening, Surround Sound System Allows Natural Voice Transmission, Accommodates walls from five to 8-1/2 inches (127 to 216 millimeters) thick. Unit easily slides into the wall opening. Made In The USA.