The PetSafe Ultimate Cat Door Works Perfectly and Our unique double flap system makes perfect sense. The Small Cat Door is for cats up to 12 pounds and the Medium Cat Door is for cats over 12 pounds and up to 40 pounds. Ultimate Cat Door Specifications

The PetSafe Ultimate Cat Door gives your cat the freedom to go in and outdoors when he pleases (unless you don't want him to, in which case you can close it with the closing panel). If you have to be away, your cat can now have access to the yard when he wants. The unique cat flap system will keep it weather tight. Now your cat can come and go as he pleases.

PetSafe Ultimate Cat Door Specs:

Rust Proof , strong extruded frame
See through design makes training easy
Unique double flap system reduces energy loss in winter and summer
Mitered frame construction
Vinyl flaps are flexible, safe and non toxic
Powder coated enamel finish for carefree maintenance
Built-in core cover
Weather strip seal
Easy installation
Lifetime Warranty on door frame, one year on flap
Steel closing panel can be installed on either side of the door
Small - For Cats up to 12 Pounds
- Flap Opening Size: 4 1/4" x 7"
- Cut Out Size: 7 3/8" x 10 1/8"
- Frame Size: 8 1/8" x 10 7/8"
Installation Instructions