Our 4-Way Locking Cat Door combines giving your cat ultimate freedom while giving you ultimate control over your cat's access in and out of your home. It allows you to choose from four access options based on you and your cat's needs: open, locked, in-only and out-only --- which are useful to keep your cat locked in at night or to take your cat to the vet. This door comes with an extension tunnel (additional tunnels sold separately) giving you the option to install it in any wall or door. Available in white.Flap Opening: 6" x 5 1/8"
Outer Frame Dimensions: 9 1/2" x 9 15/16"
Replacement Flap: MPA00-11387
Extension Tunnel: 310US