COMPATIBILITY: The PetSafe Microchip Tunnel Extension is specifically designed for the PetSafe Microchip Cat Flap (PPA19-16145/PPA19-16687) and the PetSafe Manual Cat Flap (PPA19-16732). EASY INSTALLATION: With each Tunnel Extension adding 5 cm onto the Microchip Cat Flap and the Manual Cat Flap, installation is quick and easy.
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