How to use:
For wall installations, tunnel extenders can be stacked together to create a longer approach tunnel to the SureFlap Microchip Pet Door (7118154), and the Microchip Pet Door Connect (7131210), when it is installed in a wall. The Pet Door Tunnel Extender fits snugly onto the 70mm long tunnel of the pet door. Each tunnel extender adds 50mm to the overall length of the tunnel.