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  • 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

Window Access Made Simple

7 Reviews
Made in the USA USA flag icon
Regular price $369.99 USD

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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.

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:

  • Larger dogs that require a wider or taller opening

Questions

What's in the box?

  • 1 Horizontal Window Pet Door
  • 1 Foam Weather Strip
  • 1 Center Post Weather Seal Draft Stopper
  • 1 Clamp Lock
  • Screwdriver

What type of windows does this cat door work with?

This insert is designed for horizontal sliding windows and fits directly into the window track without requiring permanent modifications.

Will this work in vertical or sash windows?

No, this model is made for horizontal sliding windows. For vertical sliding windows, a sash-specific option would be required.

Do I need tools to install this?

No tools are required for standard installation. The spring-loaded design allows the panel to compress into the track and hold securely in place.

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.

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
epanel width
step over height

Step-Over Height

3”

The distance from the bottom of the panel to the bottom of your flap.
Flap SizeFlap DimensionStep OverOverall Panel WidthRecommended Pet Height
Small6" w x 11" h3"11 1/4"9" - 15"

Aluminum panel has 1" framing, measure your track width to make sure that your window will accommodate the panel. Vinyl panels have a 1-1/4" framing.

Installation Guide

Installation Information

Endura Flap Horizontal Window Pet Door

Installation icon Difficulty Easy
Installation icon Steps 4
Installation icon Time Required 0.5 hours

Parts

  • 1 Horizontal Window Pet Door
  • 1 Foam Weather Strip
  • 1 Center Post Weather Seal Draft Stopper
  • 1 Clamp Lock
  • Screwdriver

Tools

  • Scissors
  • Flathead Screwdriver

Please read instructions & notes thoroughly before installation.

Step 1 Release Spring Mechanism

Release Spring Mechanism
  • Loosen the height adjustment locks at the top of the pet panel with the screwdriver. This allows the spring mechanism to move freely up and down.

Step 2 Check Panel Fit

Check Panel Fit
  • To insert the panel into the top track, push up against the spring mechanism and swing the bottom of the panel up and over the threshold. Seat the panel on top of the small guide rail in the track.
  • You want to put the pet door in your track before applying any weather-stripping to ensure it fits.
  • If the panel fits well, proceed to the next step. See the FAQs if you have trouble.

Step 3 Apply Weather-stripping

Apply Weather-stripping
Apply Weather-stripping
Apply Weather-stripping
  • Once you're sure the panel fits, remove it from the frame and lay it on its side on the ground.
  • For foam weatherstripping: Peel the backing off the foam weatherstripping. Press it along both edges of the panel, trimming as needed with scissors to ensure a snug fit.
  • For rubber weatherstripping: Clean the edge of your sliding door or window with rubbing alcohol to help the weatherstripping stick properly. Starting at the top or bottom, peel and press the strip into place with the folded edge facing indoors—align angled cuts if you have two pieces. For best results, apply the seal to the sliding door or window, but it can go on the pet door panel if needed.
  • Foam weatherstripping is applied onto both sides of the panel, but the rubber weather stripping only applies on the side of the slider door. Your panel will come with one type of weather stripping. You do not need both types.

Step 4 Install Center Post Weather Seal

Install Center Post Weather Seal
Install Center Post Weather Seal
Install Center Post Weather Seal
  • The center post weather seal strip (draft stopper) should be installed on the inside of the home. It can be installed on either the back edge of the sliding window panel (Figure A) or the leading edge of the stationary panel (Figure B).
  • This strip prevents air from leaking between the sliding window and the stationary panel. Trim with scissors as needed.
  • Clean the edge of your window with rubbing alcohol before installing to assure a good seal.
  • Place the panel back into the window, then tighten the height adjustment locks to lock it in place. Installation complete!
Videos

Videos

Endura Flap High-Quality Design


Endura Flap Impact Test


Leaf Blower Test


Variable Magnetic Resistance


How to Remove Side Magnets for Easier Use


FAQs

FAQ

Reviews

Customer Reviews