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PlexiDor Performance Pet Doors for Dogs and Cats – Door Mount Dog Door with Lock and Key – Silver, X-Large Sizes

Amazon.com Price: $895.00 (as of 04/07/2023 00:23 PST- Details)

Never buy replacement flaps again. Solid high impact, chew proof acrylic panels open and close tight. Keeps heating and cooling inside your home.
Accommodates Giant Breeds up to 220 pounds. Able to withstand abuse from even the most powerful dogs. Promotes exercise, good health, weight maintenance for a longer happier life.
Heavy duty springs are concealed in the hardened aluminum main frame. Comes with a lock, a key and a steel security plate.