Upgrade Cat and Dog Flap

Step 1: Stick the REAR panel on the door with double-sided tape, and use a pen to draw around the OUTSIDE of the tunnel part of the rear panel.  Step 2:Remove the rear panel and use an electric saw to cut out a tunnel hole on the door or wall.  Step 3: Put the cat door into the ...Step 1: Stick the REAR panel on the door with double-sided tape, and use a pen to draw around the OUTSIDE of the tunnel part of the rear panel.

Step 2:Remove the rear panel and use an electric saw to cut out a tunnel hole on the door or wall.  Step 3: Put the cat door into the tunnel hole.  Step 4: tighten the screws with a screwdriver, then add the screw caps.

Tips: Determine whether to drill holes for screws according to the material of the mounting surface.