PetSafe Petporte Smart Flap Tunnel Extension, White, 40 mm, Easy Fitting

40 MM Simply add this tunnel extension to your Petporte smart flap to add an additional 40 mm to your installation PETPORTE SMART FLAP This extension tunnel is compatible with the Petporte smart flap THICK WALLS Each Tunnel Extension adds 40 mm, making installing your Petporte cat flap in thicker doors and walls quick and easy FIT ANY WALL Multiple tunnel extensions can be used together to ensure a precise fit on any door or wall