Install your cat door in walls thick and thin with this tunnel extension from Petsafe. The extension is designed for Staywell cat doors adding an extra 1-7/8 inches for easy installation flush with the finish material on deeper interior walls. Two extensions are required for flush installation of exterior walls with sheathing and siding. Connect several together for even thicker applications.

Staywell Cat Door Tunnel Extension Features:

• Tunnel extension for Staywell Cat Doors
• Adds an extra 1-7/8 inches for flush installation in thicker walls and doors
• Easy to install for quick setup in most walls
• 2 extensions required (second sold separately) for installation in exterior walls with sheathing and siding
• Connect several together for even thicker applications