https://dev.to/kittendigger2/c....at-flap-installation
Cats love to look out of windows, which is a form of entertainment sometimes called cat TV. It's an instinctual and entertainment game that is usually an aspect of hunting. You can install glass window inserts that have cat flaps to doors or windows. They can also be incorporated to double-glazing. Easy to Fit You can get fitted to all types of doors and windows made of glass that have double glazing, single glazing and french doors and patio doors, bifold doors, and leaded units. These are ideal fo