Here?¡s a great way to attach your Enclosure to your home even if you can?¡t put it directly against the wall. The Kitty Tunnel is a ?¼catwalk” that allows you to place your Enclosure away from the house and still connect it to a kitty door or window. Each tunnel section has a solid redwood bottom and is 12 in. wide x 12 in. tall x 22 1/2 in. long. Can also be used to connect 2 free standing Enclosures. Custom sizes are available.