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Endura Flap Thermo Panel 3e Sliding Glass Dog Door

Endura Flap by Patio Pacific

  • $519.99
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Endura Flap Thermo Panel 3e Sliding Glass Dog Door

The Endura Flap Thermo Panel 3E Sliding Glass Dog Door is a top of the line dog door that fits into most conventional sliding glass door rails. It is unrivaled in its insulation value and is backed by a 15 year warranty not found by any other manufacturer. The semi-permanent sliding glass dog door requires zero tools to install, yet is safe and secure and easy to install.

Themo Panel 3e and Endura Flap Fit and Dimensions

Need help choosing a size? Please refer to our Pet Door Sizing and Measurement Guide found here, or talk to one of our sizing experts by calling 888-557-7387, or you can send us an email to

Thermo Panel 3e Fits any Sliding Glass Door with a minimum track width 1"

Flap Size Flap Dimension Step Over Range Overall Panel Width Stock No
Small #6 6" w x 11" h 3"-5" 11 1/4" 01PPC06
Medium #8 8" w x 15" h 3"-5" 13 1/4" 01PPC08
Large #10 10" w x 19" h 3"-5" 15 1/4" 01PPC10
Extra Large #12 12" w x 23" h 3"-7" (ships at 5") 17 1/4" 01PPC12

Height Options

  • P - 74 3/4" - 77 3/4"
  • Q - 77 1/4" - 80 1/4"
  • R - 93 1/4" - 96 1/4" (Oversize Range)

Key Features of the Thermo Panel 3e™ Endura Flap Pet Door for Sliding Glass Doors

  • Safety with High Performance – The Endura Flap’s swinging flap is manufactured out of Polyolefin, which is both safe for your pets and the environment. Polyolefin is non-toxic and recyclable. This material is also versatile in the sense that it remains flexible in temperatures as low as -40 degrees Fahrenheit, with sealing and insulating power that lasts a lifetime. The Endura Flap is designed to remain sealed in winds up to 50 mph.  No more leaky flaps!
  • Easy Installation – The Endura Flap Thermo Panel 3E Sliding Glass Dog Door requires no professional installation. It’s semi-permanent design allows you to install and remove the panel as necessary by simply loosening the thumbscrews at the top to released the spring-loaded mechanism that keeps the panel is place.  
  • High Insulation Value - The Thermo Panel 3E has a single pane, low-e glass that insulates and filters out heat for energy efficiency. Low-E, or low emissivity glass minimizes the amount of infrared and UV light that comes through the glass but does not compromise the amount of actual light that comes through.
  • High Aspect Ratio Design for the Perfect Fit – The Endura Flap pet doors are specifically designed with a high aspect ratio, meaning that the opening is taller and narrower, allowing the door to be used by many pets of different sizes. This allows for pet owners with dogs of different size and even cats to share the same door.
  • High Durability and Superior Design – The heavy duty aluminum framing along with the flap design provides supreme durability over all other pet door brands. The Endura Flap’s use of magnetic strips allows the flap to seal tightly every time it closes. No leaky flaps!
  • Secure Locking Capabilities – The sturdy Endura Flap locking cover has the strength equivalent of a 1/16” thick steel plate. This stops any intruders or pests from entering while keeping your pets inside. This panel also includes either a C-Clamp lock for adjustment ranges 80 ¼” and below, or a Foot Lock for panels 80 ¼” and above so no one can simply slide open your sliding glass door. You can also simply use a Charlie bar to prevent entry while this panel is installed.
  • Backed by a 15 year warranty – Pet's Choice is so confident in the Endura Flap that we provide an unmatched warranty of 15 years and a 90 day return policy. There is no other pet door in the market that has a warranty this long!
  • American made 100% - The Endura Flap is proudly manufactured in the Central Coast of California.

For those that are interested into why the Endura Flap is such a high performing pet door, you can see the manufacturer’s 74-page efficiency study showing how great the Endura Flap really is.

Patio Pacific Endura Flap 15 Year Warranty

To the original purchaser, Patio Pacific Inc warrants this product and all of its component parts to be free of defects in materials or workmanship for a period of 15 years from the date of delivery to the customer. 

Thermo Panel 3E Specifications

  • Manufacturer - Patio Pacific Inc
  • Your Maximum Pet Size - Cats, Large Cats, Small Dogs, Medium Dogs, Large Dogs, X-Large Dogs
  • Climate Suitability - Severe-4 Season
  • Sealing Value - Very High
  • Wind Resistance - Very High
  • Type of Window - Sideways Sliding
  • House Locking Method - C-Clamp Lock
  • Frame Material - Heavy Extruded Aluminum
  • Custom Heights Available - Yes
  • Can Fit Sideways Sliding Windows - Yes
  • Track Width Minimum - 1"
  • Built-In Adjustment For Small Measuring Errors - Yes
  • Tools Required For Installation - None
  • Patented User-Adjustable Step Over Height - Yes
  • Employs Patented Endura Flap? - Yes
  • Insulation Value - High
  • Possible to Add Additional Magnets for Greater Wind Resistance - Yes
  • Flap Material - Engage Polyolefin
  • Flap Design - Single, One Part , Flexible, Insulated Flap
  • Flap Colors - Clear
  • High Aspect Ratio - Yes
  • Flap Thickness - 7/8"
  • Award Winning Design - Yes
  • Flap Warranty (if separate) - 15 years
  • Locking Cover Material - Dimensional ABS
  • Can Be Installed In - Single Pane Glass Sliding Glass Door, Dual Pane Glass Sliding Glass Door, Vinyl-Framed Sliding Glass Door
  • Low "E" Coating - Yes
  • "Draft Stopper" Included to Seal Stationary & Sliding Panel Overlap - Yes
  • Warranty Period - 15 years
  • Return Period - 90 Days

Endura Flap Pet Door Shipping Times

  • Endura Flap Pet Door Products Ship Directly from the manufacturer using FedEx in San Luis Obispo, CA.
  • Door Mounts, Wall Mounts, and Panels can take 1-2 business days to assemble (sometimes more, we will notify you if that is the case).
  • Reference the map below to estimate the number of days it will take to receive your door.
  • FedEx Residential Home Delivery is Tuesday through Saturday and air shipments are delivered Monday through Friday. Transit times do not include weekends or holidays.
  • Tracking numbers are sent after the order has been shipped via email.

Shipping map for Endura Flap Products

Sizing & Measurement

Sizing Guide

Flap Size Flap Dimension Step Over Range Overall Panel Width Stock No
Small #6 6" w x 11" h 3"-5" 11 1/4" 01PPC06
Medium #8 8" w x 15" h 3"-5" 13 1/4" 01PPC08
Large #10 10" w x 19" h 3"-5" 15 1/4" 01PPC10
Extra Large #12 12" w x 23" h 3"-7" (ships at 5") 17 1/4" 01PPC12

Height Options

  • P - 74 3/4" - 77 3/4"
  • Q - 77 1/4" - 80 1/4"
  • R - 93 1/4" - 96 1/4" (Oversize Range)

Measuring your pet for a pet door is quite simple. Follow the simple instructions below to accurately measure your pet in order to choose the right size for your pet.

Measuring Your Pet

  1. Measure the Height

    Measuring the height of your pet is simple. The height will be used to determine how high you can install the pet door. Grab a tape measure and measure from the ground to the tallest point of your pet’s back. We suggest adding an inch or two to this measurement just to be safe.

    The top of the flap should be at least 1" above the top of the dog's back

  2. Measure the width of your pet

    The width will be used to determine the width of the flap that you will purchase. All you need to do is open a door wide enough so that your pet can walk through comfortably. Once your pet walks through, measure that width of the opening and add an inch or two for safety.

    Measure how wide of an opening your pet can fit through, don't measure the pet directly
  3. Measuring the Step-Over / Rise

    The step over or “rise” is the measurement from the bottom of your door or wall to the base of the pet door. This is basically the height that your pet must step over in order to get through the door. Please note that this measurement should be factored in with the pet’s height you measured earlier when choosing an appropriate pet door height. With step overs, the lower they are, the easier it is for the pet to get through. For dogs with health issues such as arthritis or are of old age, it is recommended that you have a small step over.

    Make sure your pet can comfortably step over the distance between the pet door and the ground

To summarize, here is a diagram of the measurements you should take:

Flap height + step over = total height. The total height should be at least 1" taller than the top of the pet's back

Measuring Your Door or Walls

Besides measuring your pet, you also have to measure your door or wall when installing a pet door. There are two measurements you must take into consideration: the rough opening size and the outer frame size. The rough opening size is the actual size of the hole that you will be cutting into your door or wall. Generally the inner frame of the pet door will fit in there. The outer frame measurement is the measurement of the outer framing of the pet door that’s usually a couple inches larger. For tight spaces, this outer frame measurement is important to know.

Outside frame dimension and rough opening measurement

Measuring for a Sliding Glass Door Pet Door

Measuring your sliding glass door is a must before purchasing a sliding glass door panel pet door. There generally isn’t a standard height for sliding glass doors and they can vary greatly from brand to brand.

Here’s how to measure:

Place the end of the measuring tape you use up inside the track as high as it will go and measure down a convenient distance and then draw a line with a pencil.

Then, put the end of the measuring tape down into the track towards the bottom and start measuring from the line you drew previously.

Simply add those two numbers together and you got your track height.

If you measure all at once, you might not get the most accurate number as the measuring tape curves towards the bottom. The different sizing ranges for panels is precise and if you happen to mis-measure, it will become a hassle.

Other Things to Consider When Choosing the Correct Size Pet Door

If you currently have a puppy or kitten, remember that they will continue to grow. Finding out the size that they will be approximately can help you make the right purchase. People often judge this based on their parents’ size.

Having a door that is mounted low gives more comfort for pets to step over. Young pets should have no problem going through a door, but as they age, having a higher step over can become an issue for pets with health issues.

Making sure the pet door is tall enough for your pet is also crucial with age as having a pet door that is too short will require hunching from your pet, which over time can be hard on your pet’s hips. Flaps will generally last longer too if the pet isn’t rubbing against the top part of the door as well.

If you have multiple pets, make sure that the door you get can accommodate all of them. It must be low enough for the shortest pet to step over but also tall enough for the tallest one to fit through comfortably.

Got any questions on measuring? We're here to help. Call us at (888) 557-PETS or send us an email at 

Installation Instructions

Endura Flap Thermo Panel 3e Sliding Glass Dog Door Installation Instructions

Click here for the Endura Flap Thermo Panel 3E Installation Manual



To the original purchaser, Patio Pacific Inc warrants this product and all of its component parts to be free of defects in materials or workmanship for a period of 15 years from the date of delivery to the customer.

Endura Flap assemblies employed in commercial kennels are warranted for a period of 3 years.

Damage caused by accident, improper installation, abuse or normal wear, including damage by pets or glass breakage is specifically excluded from this warranty.

Defective materials returned to Patio Pacific Inc, together with proof of purchase, will be repaired or replaced and returned to the customer free of charge.

Pet doors of other manufacturers installed in Patio Pacific products are covered by the warranty of the other manufacturer and not by Patio Pacific Inc.

    Customer Reviews

    Based on 17 reviews
    Mary Hunter

    My son installed my Endura Flap Thermo Panel 3e Sliding Glass Dog Door with extra large door several days before Thanksgiving 2021 in my sun room sliding glass door. It was so easy for him that I think a senior citizen such as myself could have installed it. The door is wonderful and I am not having issues with keeping the room heated as I was with my previous dog door that I my son installed about five years ago with no insulation. All necessary items [plus a screw driver] were included with the door. Keep up the great work and I believe if I remember correctly it was MADE IN THE USA which is very important to me.
    I recommend your product to anyone and EVERYONE who has a large dog and small dog.

    Jean Hanuska

    Endura Flap Thermo Panel 3e Sliding Glass Dog Door

    Anne Nelson
    High quality, well designed

    We are very pleased with our purchase of the Endura Flap Thermo Panel Sliding Glass Dog Door. It was easy to install, looks great and functions well. At first we thought there might be too much magnet power for our dog (9 year old Australian Shepherd), but within four days she was a pro at opening it. Now she seems to enjoy having that skill. This dog door will be secure even in stormy weather.

    Rusty Moore
    Well worth it!

    We needed an extra large dog door to fit our sliding glass door. The Endura panel has proven to fit perfectly, install easily, and our dog learned to open quickly. The magnets keep our persistent west winds from blowing open the flexible door flap. So if you need this type of dog door, spring for the best and you won’t regret it!

    Works well.

    We recently moved to Central Oregon, where it gets quite cold. We also got a bigger dog. This was super easy to install in the slider. Seems to be fine, and the room is still warm.

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