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If your door or wall too deep for your cat flap, add single or multiple extensions for easier installation. The PetSafe Cat Flap Extension Tunnel allows your cat door to be installed into thicker doors or walls and is compatible with the PetSafe Manual 4-Way Locking Cat Flap. This extension tunnel measures (1 7/8") deep. Trust PetSafe to help keep your pet healthy, safe and happy.

• Compatibility - Cat Flap Extension Tunnel is compatible with the PetSafe Manual 4-Way Locking Cat Flap
• When to Use - Use the extension tunnel when you install your cat door into thicker doors or walls; extension tunnel measures (1 7/8") deep