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PetSafe Wall Tunnel Extension Electronic Pet Door, Large, White

Amazon.com Price: $51.95 (as of 04/10/2023 00:26 PST- Details)

Extension tunnel used in conjunction with the PetSafe SmartDoor Wall Entry Kit for walls thicker than 7 1/4″
Extends an additional 2 3/4″
Tunnel extension can be trimmed for extension less than 2 3/4″