PetSafe Medium Wall Entry Pet Door with Telescoping Frame – Insulates Better than Metal Doors, Energy Efficient Cat… Price: $119.95 (as of 01/30/2023 07:42 PST- Details) & FREE Shipping.

ENCOURAGE EXERCISE AND INDEPENDENCE: Give your cats and dogs freedom to go in or out without asking for your help to open the door—perfect for potty breaks or play time
INSTALL ANYWHERE: A wall-entry door is great for homes where installation to an entry or side door is not practical
TELESCOPING WIDTH: The telescoping tunnel accommodates walls that are 4 3/4 – 7 1/4 in thick; compatible extension kits for thicker walls over 7 1/4 in are sold separately