This 2-way pet door 757 from PetSafe will give your little friends a free pass to enter or leave the house. It is suitable for dogs with a maximum weight of 18 kg. This PetSafe pet flap was formerly known as the Staywell pet flap. It fits most standard windows, walls and doors. The pet door is a must-have for your adventurous pets. When you are not home, they can still go out for a walk whenever they like. If you want to keep your pets from going out at night or on extreme weather situations, you can easily lock the pet door with the included closing panel. Consisting of a sleek, durable frame and a rigid, transparent flap, this unobtrusive pet door will suit your home decor and make a nice entryway for your little friends!