Additional tunnel for the Wall Entry Aluminum Pet Door™ (new model). Install your door in a wall more than 7¼ thick with this additional tunnel extension. The tunnel overlaps the pet door frame by 1 inch and fits walls 8¼ - 10¾ inches. You can also cut the tunnel shorter if you need to install it in walls 7¼ - 8¼ thick.

• Compatible with the following PetSafe Pet Doors: Plastic Wall Entry Door (model # ZPA00-16201) ; Aluminum Wall Entry Door (model # PPA11-10915)
• Extends Wall Entry doors from 7 1/4" to 10 3/4" thick
• Tunnel can be cut shorter to accommodate walls 7 1/4" to 8 1/4" thick