This wall extension is the only fit for your PetSafe cat door models. One per box.
Install your cat door in walls up to 4 inches thick and thin with this tunnel extension.
The extension is designed for PetSafe cat doors and adds 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.
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