Petsafe Installation Adaptor for Microchip Cat Flap & Manual-Locking Cat Flap Installation Adaptor for installing the Microchip Cat Flap and Manual-Locking Cat Flap into windows, walls and metal doors. Compatible with the PetSafe Microchip Cat Flap and the PetSafe Manual Cat Flap Easy Installation Fits openings with a diameter of 212 mm to 285 mm Cat Flap sold separately Product Dimensions : 12.1 x 1.4 x 12.4 Inches
eBay