These mounting adaptors allow installation of the sureflap microchip cat flap the dualscan microchip cat flap or the sureflap microchip pet door in a window or wall allowing the pet doors to be mounted in circular holes detailed installation instructions can be found in the user manuals for each product the cat flap mounting adaptor at a glance adaptor to allow you to build sureflap cat flaps into walls and windows for use with the sureflap microchip cat flap or the dualscan microchip cat f