https://zenwriting.net/hillear....th9/through-wall-cat
Are you fed up with having to climb up and down to open your door for your pet? If you are, then a cat flap could be the solution. Pet-flap fitters are able to install them into any kind of door, including uPVC or composite doors. They can also install them into some types of walls. Security Cat flaps are usually fitted to doors, but many also have them installed on windows or double-glazed doors. If you don't have a wood door or wall or window, installing one in glass is a great option. It's also a great solution for renters. You