This wall or door-mounted pet door fits walls between 4.75 and 7.25 inches thick and comes with a full installation kit, so even a first-time installer can get it fitted and sealed in an afternoon. A metal frame holds three frosted PVC flaps in place, and that layered flap design is built to shut out wind, rain, and cold rather than just flapping loosely in the opening. Each flap has a hinge that lets it swing open with a light push from your cat or dog, and a magnetic closure pulls it shut again quietly so it doesn't bang every time your pet comes or goes. When you want to close off the opening entirely, a built-in locking mechanism with a metal plate keeps the flap sealed shut, handy at night or whenever you'd rather keep other animals from wandering in. The white aluminum frame with tan-toned flaps blends into a wall or door instead of standing out.