Pet Door Sash Window, white, with 7x7 Flap up to 25lbs. (22-24L) Pet Sash Window with 7x7 Transparent Flap opening up to 25 lbs. pet will fit all horizontal windows. It comes with a sliding 2 inch sliding wedge that fits beside the window and can be easily cut to size if its too wide. Window comes with a  thick clear glass and has NO plastic cloudy accordion adjustments. This window will blend with your present window and will not be highly noticeable. Window is completely vinyl, NO rot lifetime warranty. No thief can get in but your pet can get in and out. Flap has a 4-way locking mechanism, pet can go out but cant come in or can come in and cant go out or just let your pet come and go. and has a rainproof seal and will not flap in the wind. Flap is completely silent and will not frighten pets or disturb owner. This pet window has been rated best design in its field and has five stars.