• Lets your cat come and go without opening the window
  • Helps maintain indoor comfort in changing weather
  • Installs quickly with no tools or permanent changes
  • Durable aluminum or vinyl frame built for daily use
  • Clear glass maintains visibility and natural light
  • Magnetic seal supports consistent flap closure
  • Includes locking cover and clamp lock for added security

Endura Flap Cat Door for Horizontal Sliding Windows

Easy Window Access for Cats

6 Reviews
Made in the USA USA flag icon
Regular price $369.99

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Lifetime Warranty

Color: White
Frame Material
Height Adjustment Range


Gives your cat easy, secure window access with an adjustable sliding window insert, insulating glass, and a weather-sealing flap designed for everyday comfort and flexibility.

This insert is made specifically for horizontal sliding windows, creating a clean, integrated way to add a pet door without cutting into your home. It sits within the track, allowing your window to retain its original structure and appearance.

Quick Setup No Commitment
The spring-loaded design uses pressure within the track to hold the panel in place, allowing for fast installation and easy removal. This makes it a practical option for renters or anyone who wants flexibility without permanent changes.

The clear safety glass allows natural light to enter while helping reduce energy loss. Combined with the magnetic-sealing flap, this setup helps limit drafts and maintain a more stable indoor temperature.

Built for Everyday Use
The aluminum and vinyl frame options provide long-term durability, while the weather-resistant flap is designed to handle repeated use. This creates a dependable access point your cat can use throughout the day.

The adjustable panel height allows the insert to fit a range of window sizes, and custom options are available for more unique setups. For higher windows, adding a step or ramp can help make entry easier for your cat.

Installation & Fit

  • Fits horizontal sliding windows with a minimum track width of 1 inch for aluminum frames and 1-1/4 inches for vinyl frames
  • Installs using a spring-loaded panel that compresses securely within the window track
  • Secures in place without permanent fasteners or structural modification
  • Adjusts to fit window openings between 34 inches and 37 inches in height
  • Removes easily for seasonal use or relocation without altering the window
  • Includes a C-clamp lock to stabilize the panel within the track

Best Suited For

Ideal for:

  • Cat owners who want a no-cut, removable window access solution
  • Renters or homeowners who prefer not to modify doors or walls
  • Homes where maintaining natural light and outdoor views is important
  • Cats that use the door frequently throughout the day.
  • Households looking for insulation and weather resistance in a window setup
  • Small dogs that can comfortably fit through the cat-sized opening

Not ideal for:

Questions

Can I flip the flap direction?

Yes, the flap orientation can be adjusted to better fit your window setup and space.

Can small dogs use this too?

Yes, small dogs that fit comfortably through the opening can use this door, but it is primarily designed for cats.

Is the glass insulated?

Yes, the insert uses clear safety glass (3/16" thick) designed to help reduce drafts while still allowing natural light into your home.

Explore all questions
Product Details

Product Details

This insert is made specifically for horizontal sliding windows, creating a clean, integrated way to add a pet door without cutting into your home. It sits within the track, allowing your window to retain its original structure and appearance.

Quick Setup No Commitment
The spring-loaded design uses pressure within the track to hold the panel in place, allowing for fast installation and easy removal. This makes it a practical option for renters or anyone who wants flexibility without permanent changes.

The clear safety glass allows natural light to enter while helping reduce energy loss. Combined with the magnetic-sealing flap, this setup helps limit drafts and maintain a more stable indoor temperature.

Built for Everyday Use
The aluminum and vinyl frame options provide long-term durability, while the weather-resistant flap is designed to handle repeated use. This creates a dependable access point your cat can use throughout the day.

The adjustable panel height allows the insert to fit a range of window sizes, and custom options are available for more unique setups. For higher windows, adding a step or ramp can help make entry easier for your cat.

Size icon Sizing & Fit

Size Chart

Flap Dimensions:

6"w x 11"h

The entry way your dog goes through.

Overall Panel Width

11 1/4"

How wide your panel is.

Flap dimensions
Panel width
Step over height

Step-Over Height

3"

The distance from the bottom of the panel to the bottom of your flap.

Flap Size Flap Dimension Step Over Range Outside Frame Dimension Recommended Pet Height
Small 6"w x 11"h 3" 11 1/4" 9" - 15"

Do not know which size to get? Here is a measurement guide to help you out.

Aluminum panel has 1" framing, measure your track width to make sure that your window will accommodate the panel.

If your measured track height does not fall within one of the ranges above, we can make a custom height. Custom height option may take up to 4 weeks to special order the glass and build the panel. If your measured track height is near the bottom of the adjustment range then you should review A Note of Caution.

Videos

Videos

Adjusting Your Endura Flap® Magnet Strength


Design of the Endura Flap


The Endura Flap Pet Door


FAQs

FAQ

Reviews

Customer Reviews

Request Freight Quote

Track heights exceeding 106 inches (107" or higher) may require additional shipping charges. Please provide your contact information for a custom freight quote, and our team will follow up during normal business hours.