Whiskers and Windows Cat Door for Vinyl Horizontal Sliding Windows | Great for Cats | Easy Entry and Exit Control | Large Cat Flap, Fits Windows 34"-37" h, White

The Whiskers and Windows Horizontal Cat Door for Windows is a fast, affordable way to install a pet door in your home. This window insert requires no drilling, cutting, or contract work, and just a flat-head screwdriver for installation. The spring-loaded design allows for instant adjustment of up to 3 inches and creates a snug weather-tight fit. This pet door comes in a robust vinyl frame, ensuring that it will match your window framing. Great for cats and small dogs, this pet door will give your pets the freedom to come and go as they please. A four-way lock is included to provide security and access control: fully locked, in-only, out-only, or unlocked. Simply use the red and green locking tabs to close it so nothing can enter or exit, allow access in and out, or allow the pet to come in only at a certain time, or out only so they can't come back in until you allow it. Measure these four things to ensure proper fit:1. Height and Width of Your Pet: The small flap is 6" wide x 6" tall for pets up to 8” tall. The large flap size measures 7" wide x 7 1/2" tall for pets up to 10" tall. Be sure to include the 2" inch stepover when calculating the opening height. 2. Height of Window Track: Measure inside your track from the deepest point on the bottom to the deepest point on the top. Choose the size that will fit between the four available sizes: 34" - 37", 43" - 46", 46" - 49" and 57" - 60". If your window track measurement is within 1" of the bottom you will need to make sure that you have enough clearance to get it into the track. If your window measurement is outside of either of these ranges it will not fit properly. 3. Width of Window Opening: Your window must be able to open 14" wide for the small size and 16. 5" wide for the large size. 4. Track Thickness: must be at least 1-1/4" thick. It will fit in wider tracks but may need to be secured.