SureFlap Pet Door Tunnel Extender (White)

• Extends the tunnel of the SureFlap Microchip PET DOOR for wall installations

• Adds 2" in length to the 2¾" length of the tunnel on the SureFlap Microchip Pet Door

• Multiple tunnel extenders can be stacked together to create a tunnel of any length

• Used for the PET DOOR size NOT the Cat Door/Flap