Pet Door Dog Window Door Round Clear Flap Door with 4 Way Lock and Liner Kit for Cats, Dogs and Puppies Best for Screens, Sliding Glass Doors, Glass Window 【4-WAY LOCK (IN, OUT, IN/OUT, LOCKED)】The cat flap is equipped with four models, can be locked by switch, just swing, only in and out and fully locked, easy to control your pet and up; with Cat flaps so you don’t have to keep closing and opening doors to wait for your pet 【Perfect Glass Decoration】Clear design gives the window screen an overall quality, perfect for window screens, sliding glass doors, glass windows; suitable for all glass application applications; your pet will immediately fall in love with the stylish pet flap 【Silent and Convenient】Two parts with cat flaps; door brush strips eliminate door closing noise, and internal rubber ring protects cats from harm; silent action won’t scare pets or disturb owners, allowing cats to use his litter freely 【DURABLE AND WEATHER-RESISTANT】The entire cat door is made of durable PC