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PetSafe Wall Entry Aluminum Pet Door Extension Tunnel, Medium

Amazon.com Price: $35.09 (as of 04/09/2023 01:01 PST- Details)

Compatible with the following PetSafe Pet Doors: Plastic Wall Entry Door (model # ZPA00-16202) ; Aluminum Wall Entry Door (model # PPA11-10916)
Extends Wall Entry Doors from 7 1/4 in to 12 in thick
Tunnel can be cut shorter to accommodate walls 7 1/4 in to 8 1/4 in thick