Our littler box is out on the lanai also. I cut a piece of wood wide enough to fit snugly in a window frame and high enough to hold a small cat door. Cut a hole in the wood for the cat door and screwed it on. Lifted the window, inserted the wood, and closed the window down on top of it. Have been using this for almost 10 years now. The litter is outside, and the cat can come and go whenever it wants to, day or night. Never have to get up to let the cat out or in. A vertical short stick cut to length holding the window down on top of the wood acts as a lock ( like a sliding door ) to maintain security.
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Oswego, NY
Love The Villages
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