The Staywell  4-Way Slim Clear Cat Flap is a great choice for any cat or small dog. This door is well crafted and will last a lifetime, and provides peace of mind by allowing you to give your pets the freedom to enter and exit the house as they please. Bad weather or unsafe conditions outside are not a problem either. You can enable the lock to keep your pets in or out.  It has a completely open setting, as well as an in-only, out-only setting, so you can let your pets in by one direction only.

Features:

• Slim design takes up little space.
• Maximum shoulder width: 7 1/8 inch.
• Gives pets freedom without inconvenience.
• For cats up to 22 pounds and dogs up to 40 pounds.
• Universal fitting for glass, sliding windows, sliding patio doors and doors.