Want to give your cat (or small dog) access to a specific room, like the bedroom or laundry room where the litter box is, but still want to keep the door closed sometimes? This interior pet door is the perfect solution. It's a medium-sized flap (the opening is about 5.9x5.9 inches) that you install right into your interior door. The best part is the 4-way lock: you can set it to 'In Only' (so they can come in but not leave), 'Out Only', 'Both In & Out' for free passage, or 'Fully Locked' to block it completely. It's made of durable ABS plastic, has a brush seal to reduce noise and drafts, and is easy to install with basic tools (you'll need to cut a hole in your door). It gives your pet independence while you keep control. Perfect for keeping dogs out of cat food areas or just giving your feline friend their own private entrance.