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allow your cats to come and go whenever they like. However, if you're looking to ensure the security of your home it is crucial to install an animal flap that is lockable. SheffLOCK can assist you find a Tasker that is experienced in the installation of pet flaps onto sliding doors. You can then rest assured that your home is secure. Cost A cat flap can be incorporated to a sliding glass door to allow your pet to go in and out as it wishe