PetSafe NEVER RUST Wall Entry Pet Door – Telescoping Frame – Insulates Better than Metal Doors, Energy Efficient Cat & Dog Door – Interior & Exterior Walls, Weatherproof, Easy to Install & Clean – M Price: $129.99 (as of 10/01/2023 00:41 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