Perfect Pet Soft Flap Cat DoorUnlike other parts of the world, 90% of companion cats in the United States never go outside. Yet millions of owners have discovered that a cat flap is the ideal way to move the litter pan from the living area of the home to the garage, basement or utility room. And with the litter pan goes the dust, tracking mess, and odor. Also those with dogs and cats can segregate the cat's food and waste from a hungry or curious dog. Easy to install telescoping frame adjusts to fit 1 1/4 to 2 door thickness. Flexible transparent flap, strong ABS frame and self-locking slide make this a must have.