Those looking to extend the depth of their cat door can do so using this TRIXIE Pet Products Tunnel Extender for 4-Way Cat Door with Tunnel. This easy-to-assemble extender allows you to extend the depth of your Trixie 4-Way Cat Door with Tunnel by up to 1.25 inches.

Features: Extends depth of 4-Way Cat Door with Tunnel by up to 1.25 inches, One year warranty
Includes: 1 tunnel extender
Color: White
Environment: Indoors
Dimensions: 7 in W x 7.75 in H
Material: Plastic

Cleaning Instructions: Wipe away any debris using a damp cloth