Petsafe Staywell Big Cat-Small Dog Door 4 Way White Use the 4-lock of way, to allow cats to come and go like them, or, if necessary, secure indoors or outdoors to keep them. The lock options include: indoors, outdoors, completely open and completely closed. Thanks to a choice of three colours (white, wood colours and grey) is the manual flap for all doors, walls and materials and can be in addition building into a wall as to the thickness. Suitable for cats weighing up to 7 kg.