https://perfectworld.wiki/wiki..../Cat_Flap_Installati
Are you tired of having to climb up and down to open your doors for your pet? If you are, then a cat flap could be the solution. Pet-flap fitters can install them in any type of door including uPVC or composite doors. They can also put them in a variety of wall types. Security Cat flaps are often installed on doors, but many have them installed on windows or double-glazed doors. If you don't have a wooden wall or door, having one installed into glass is a great option. It's also a great option for rent