Two Height Ranges Available 3.0 Model Adjusts from 32-1/2" to 35-1/8” or 4.0 Model Adjusts from 43-7/8” to 46-1/2”
· High quality white finish aluminum construction installs easily into most aluminum vertical sash (side sliding) window styles.
· Locking rigid flap is made of unbreakable clear Lexan to allow pet to see through opening and is non-toxic for added safety
· Flap Size: 7-1/2” x 10-1/2”. Recommended for pets 2 to 25 Pounds
· Chubby Kat has a 4-way locking knob that you manually turn to desired position: in only, out only, free in/out and locked.
· Elegant white aluminum finish: Crafted with high-quality materials, it's not just durable but also adds a touch of elegance to your window and thanks to its spring-loaded top, this pet door offers a handy 2.5" adjustment range.

To determine the correct size door, simply measure the width (A) and height (B) of your pet.
(A) Measure the widest point of your pet's shoulder.
(B) Measure from the top of your pet's back (just behind their head) to the bottom of chest.
Pet door models have different size openings. Just make sure your new pet door's opening is both wider and taller than your pet's measurements to ensure they can comfortably pass through.