The SureFlap Tunnel Extenders are fully compatible with OnlyCat and are used for extending the entrance of the cat flap – typically through walls or thick surfaces.

Each tunnel extender adds 50mm to the 70mm tunnel of the cat flap. Multiple tunnel extenders can be stacked together to create a tunnel of any length.

See our wall installation guide for details on how these are used.

Suggested quantity of tunnel extenders required based on wall/door thicknesses: