Pet Mate Cat Elite Wall Liner (308) - Works with the 305, 355, One Size

Compatible Devices: Cat Mate Elite ID Disc Cat Flap, Cat Mate Elite Microchip Cat Flap, Cat Mate Microchip Cat Flap (Cat Mate Wall Adapter Kit Required for direct fit). Requires Adapter Kit (361) for walls/glass panels, providing a tunnel adapter and neat faceplates inside and outside.

eBay