https://zenwriting.net/seederb....oard9/fit-a-cat-flap
Are you fed up with having to get up and down to open your doors for your pet? may be the answer. Pet-flap fitters can install them on any type of door including uPVC or composite doors. They can also be fitted into certain types of walls. Security Cat flaps are often fitted to doors, but many people also have them installed on windows or double-glazed doors. If you don't have a wooden door or wall or window, installing one in glass is an excellent option. It's also a great option for those who rent. You'll need a