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PetSafe 300 Series Tunnel Extension White (310US)
If you are putting a pet door into a thicker door or wall, it usually requires a tunnel extension.
This tunnel extension is designed for the Staywell 300, 400 and 500 series cat flaps, and the PetSafe PPA00-11324 and PPA00-11325 4 way cat flaps. It adds an extra 1-7/8" of depth, and you can combine more than one for even thicker walls and doors.
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