Sure Petcare SureFlap Microchip Pet Door (large) Tunnel Extender for Walls and Doors Hot

The SureFlap Microchip Door Tunnel Extender allows you to mount the door into thick walls including a home’s interiror and exterior walls.

The extender fits into the tunnel of the microchip door, and you can even use multiple extenders in extra thck walls – just stack them together to form a tunnel of any length.

Two sizes available:
Small Cat Door Extender (for both the Dualscan--DSCF001, and Small–iDSCFWT) –Adds 50mm to the existing cat door’s 70mm tunnel.
Large Pet DoorExtender-Adds 50mm to the existing pet door’s 70mm tunnel. For Sureflap SUR101.

Available in White or Brown

To calculate the number of tunnel extenders you will need, please refer to the chart in the images.