https://zenwriting.net/stateol....ive08/doors-with-cat
Double glazing can be equipped with dog and cat flaps to allow your pets to come and leave as they please. They also help keep your pet safe while you're away. You can install the cat flap inside an existing uPVC or double glazing sealed unit. However, you will require a new part with an opening already made. can do this with the proper equipment and the right training. Easy to install A cat flap is an excellent option for allowing your pet access to the outdoors without you having to constantly shut and open your doors. There are