https://botdb.win/wiki/Cat_Fla....p_Installation_Near_
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A cat flap that is through the wall is a great option to let your pets move around as they please. You must be careful to not install it too high into the wall. This can lead to energy loss and also the possibility of burglars gaining access to your home. Additionally, if you're planning to sell your house in the near future and you have a hole in a cavity wall can be an issue for new owners. Glass cat doors are a safer option. Easy to install A cat fla