Removable Pet Door Panel Insert

(17 customer reviews)



The Thermo-Panel 3e is the best all-around patio panel pet door for sliding glass doors featuring the award-winning Endura Flap™

Sliding Glass Doggie Door Insert

  • Insulated, single pane, Low-E, 3/16″ thick glass, in sturdy aluminum framing
  • Safe and energy-efficient flap for pets
  • No tools are required for installation, perfect for renters or vacation homes
  • Adjustable heights and custom sizes to fit all sliding glass door models

Endura Flap logo - Pet Door Products Salt Lake City

Made in the USA graphic - Sliding door dog door insert MADE IN THE USA

Additional information

Weight 34 lbs
Flap Size

Extra Large, Large, Medium, Small

Frame Color

Bronze (Dark Brown), Brushed Aluminum, White

Width Adjustment Range

22 in. – 25 in., 25 in. – 28 in., 28 in. – 31 in., 31 in. – 34 in., 34 in. – 37 in., 37 in. – 40 in., 40 in. – 43 in., 74 3/4 in. – 77 3/4 in., 77 1/4 in. – 80 1/4 in., 93 1/4 in. – 96 1/4 in., Custom – 80 1/4 in. – 93 1/4 in., Custom – Over – 96 in., Custom – Under – 74 3/4 in.


Sliding Glass Doggie Door Insert

The removable pet door panel insert is one of the most popular products we carry. Some of the benefits of using our patio panel pet door include:

  • A sliding glass door pet door insert provides a pet with the freedom to move about the house and outdoors at will
  • This dog door for glass panel door can also help pets overcome common behavioral problems ranging from chewing to barking and even housebreaking issues
  • A pet door is more convenient for pet owners as they will not have to constantly get up to let the pet outside
  • Pet safe doggy doors are also easy to lock when pet owners do not want to use them
  • Get the best removable dog door for sliding glass doors

At the same time, there are plenty of options for pet doors, so why are so many people choosing Pet Door Products in Utah? for their sliding door dog door insert? Some of the top reasons include:

  • The doggie door is secure, as a locking cover can be used to close the door when it is not in use
  • The removable pet door panel is durable and will not break down with routine use
  • It is easy to install the removable pet door panel insert
  • This energy efficient dog door keeps utility bills low


Why should I buy an Endura Flap?

The flap allows your pets to enter and exit the house while ensuring that your home’s comfort and security is maintained. The Endura’s locking cover is flexible and soft enough to stay intact in any weather to deter the entry of unwanted guests. It’s good for giving your pet independence while keeping your home secure.

How to install the Endura flap dog door?

The flap doors can be installed by following DIY instructions or seeking professional help. The DIY flap door is delivered with a DIY manual. If you need professional help, a pro installer shall be dispatched to you. Outside our regions, you may need to seek the help of existing Professional flap door installers within your area. Local pet installers are available in the directory.

Is it easy for dogs to use the Endura Flap door?

The Endura flap door is made for the primary purpose of ensuring that your dog comfortably enters and exits the house. The door comes in different customizable sizes to fit all sizes of the dogs. When you use the correct dimensions to create your door, the dog shall not have to strain in it’s going out and coming in. It takes a few days for it to get used to using the flap pet door.

How energy efficient is your Endura Flap door?

The Endura Flap dog door is energy efficient in its installation and operation. The door has a unique mounting system which requires no special fasteners to fit the existing glass unit size. The safety glass used to build the door is insulated and energy-efficient. The flap is designed to seal using the magnetic field, which helps to reduce energy loss.

How much time does an installation take?

Professional installation may take some weeks because you need the installer to come to your residence a few days after you make the purchase. The installer takes the measurements required for the door and returns after 1-2 weeks to complete the installation for your flap door. The DIY installation, on the other hand, takes the shortest time possible depending on your crafty skills.

Are Endura Flap doors secure?

The flap doors help to promote security as it keeps you on toes. You gain curiosity about who enters and who exits using the flap door. The door also comes with an extra cover which can be used to seal it when it is not in use. The door is flexible to keep your pets safe and protected.


For the original purchaser, Endura Flap Pet Doors come with a warranty on all products and all of its component parts. They should be free of all defects in either materials or workmanship. The warranty lasts 15 years, with the start date being the date that it is delivered to the customer.

All Pet Door Products Endura Flap Pet Doors that are employed in commercial kennels are warranted for a period of three years.

There are a few cases where this warranty will not be valid. These include:

  • Damage to Endura Flap Pet Door products that are caused by accidents
  • Damage to products due to improper installation
  • Damage stemming from normal wear and tear
  • Damage stemming from abuse

These exclusionary criteria include damage caused by pets or glass breakage.

If there is a warranty claim, any and all defective materials must be returned along with proof of purchase. If the warranty is honored, then the products will either repaired or replaced and returned to the customer.

It is important to note that all sales on extra-large products are final with no returns or exchanges.


Some of the most popular features of this sliding door pet door extension include:

  • Insulated: The Endura Flap Dog Door is highly insulated. It comes complete with a magnetic seal that will remain closed in winds up to 50 MPH. The flap is made out of an advanced polymer that will ensure that your home remains popular.
  • Energy Efficient: This insert is an energy efficient dog door, ensuring that this insert will not drive up your utility bills
  • Versatile: These pet safe doggy doors fit the vast majority of vertical sliding sash window widths
  • Customizable: There are multiple doggie door sizes available when it comes to the Endura Flap Pet Door, ensuring that you can find the perfect option to meet your needs. Furthermore, there are also multiple colors from which to choose.
  • Easy Installation: This product can be installed in a matter of seconds. If you need to remove it later, the removal process is just as easy. There are no tools required.
  • Longer Lasting Flap:The flap rotates on a rod rather than screwed into the frame to avoid extreme wear and tear, making it a longer lasting flap. Because the flap is made of PVC rather than Vinyl, the flap will not warp or yellow in direct heat.
  • Secure: The locking cover can be placed over the pet door to ensure that intruders will not be able to come in through the dog door. Locks will also be provided to secure your sliding glass pet door to your frame.
  • User Adjustable Step Over: This allows you to tailor the panel height to your pet’s personal size so that they may comfortably use the pet door. This is ideal for dogs with long legs (such as Great Danes) or short legs (such as a Corgi)
  • Adjust Magnet Strength: Option to add or decrease magnet strength to increase already significant wind resistance or training pets.
  • 100% made in the USA

These are just a few of the top features of the removable pet door panel. Furthermore, this product comes with a 90-day return policy on all sizes except the extra-large size. All of our products are 100 percent made and manufactured in the United States.

Customized Options:

Frosted Glass Option: Your panel may be special ordered with frosted (bathroom) glass to give you extra privacy. This also allows you to partially open your drapes to access the pet door without losing privacy. Frosted glass panels are final sale, no returns, and requires an extra 3-4 weeks to custom order the glass.

Replacement Parts and Accessories:

  • Replacement Flap
  • Locks for Sliding Glass Doors
  • Height extension
  • Weatherstrip
  • Draftstopper

Flap Sizes

Our removable patio panel pet doors come in a variety of sizes to accommodate dogs from small to large. In order to select the right size, pet owners should consider not only the size of their dogs but also the sizes of their doors as well. Furthermore, if pet owners expect their furry friends to grow, then it might be a good idea to go with a door that will match the expected adult height.

Finally, please note that we have customized door flap options as well! If you need help figuring out which size is right for your dog, then contact us and ask for assistance!

17 reviews for Removable Pet Door Panel Insert

  1. 5
    (17 customer reviews)
    100% of customers recommend this product.
    5 Stars100%4 Stars0%3 Stars0%2 Stars0%1 Star0%
  2. Katerin

    Pet Door Products is really great. The product arrived and I installed it the same day. It fit perfectly.Our dogs started using it by the next afternoon.

  3. Elenor

    Pet Door was awesome to work with! Our dogs love the freedom to go in and out when they want and I love not having to go open the door every 5 times. Thank you!

  4. yukeen

    They did such an amazing job with the outdoor! It doesn’t let any cold air in, and the dogs love it!
    Thank you Pet Door Product

  5. Jaine

    Pet door products are awesome! I love my dog door and so do my dogs. They have been awesome!!!!

  6. Charile

    Pet Door was awesome to work with! Our dogs love the freedom to go in and out when they want and I love not having to go open the door every 5 times.
    Thank you!

  7. Betty

    Our dog love the freedom to go in and out when they want and I love not having to go open the door every 5 times. and Also we get to take the door with us when we move.

  8. Brithiney

    I ordered a custom dog door and Pet Door Products had the best price by far! I am very satisfied!

  9. Tomyy

    The product arrived and I installed it the same day. It fit perfectly. Our dogs love the freedom to go in and out when they want. Thank you Pet Door!

  10. Jones

    It works great. Our dogs and cat use it all of the time to go out back. I am happy with the purchase.
    Thank you!

  11. Daveyi

    Fast and efficient install! They had the old out and new in, in no time at all. And they disposed of the old! Very professional and great customer service.More than happy! Thank you Pet Door

  12. Felix

    They were just great. The installers were on time and did a great job. We just love the new pet door!!

  13. Phil

    Pet door products went above and beyond all expectations. My family and our dogs love the product.
    Thank you!

  14. Zaylen

    We purchased the insert from out of state and they coordinated working with a local company to get it installed. Thank you Pet Door Products

  15. Davil

    Pet door products went above and beyond all expectations. The product arrived and I installed it the same day. Our dogs started using it by the next afternoon.

  16. Monica

    Great service installing my door. The door seems to be excellent quality and pet door is very well insulated. Dog loves the door and is in and out all day.

  17. Rachel

    Pet Door was awesome to work with! Our dog love the freedom to go in and out when they want and I love not having to go open the door every 5 times. and Also we get to take the door with us when we move.

  18. Alyssa

    Highly recommend!! This is an awesome pet door! We are renters and cannot make changes to the home. This allows our pets to come and go, plus we get to take the door with us when we move.

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Customer Reviews

What Our Pet Door Customers Are Saying

Kaylie Shaw
May 31, 2024

Patrick was awesome! He was super helpful and detailed with the whole process.

Levi Peterson
May 31, 2024

Great product and great experience through the whole process! Patrick really helped us find the right fit for our dog.

Scott Eliot
May 31, 2024

We had a great experience working with Patrick. He gave us a fair quote and the install was quick. Our dog Charlie loves being able to come in and out as he needs. When I get a bigger house with more doors I’ll be sure to reach back out to Pat and the Pet Door team.

Mandi Jones
May 26, 2024

We love our pet door. It’s a clean and professional look. Highly recommend.

Angela Sachs
May 24, 2024

Pet Door Products have been wonderful to work with. They are quick and reliable! I was a bit worried about my VERY LARGE lab fitting through the door but it’s perfect and both of my dogs picked up on it so quickly. I also love that the magnet that keeps the flap closed is strong enough to stay closed during wind storms. Can’t say enough about this product and how much my dogs and my family are enjoying this.

Stacy Basham
April 29, 2024

Excellent service, great install and very high quality product. Very impressed with the durability and structure of the product. Would recommend to family and friends.

Adam Lay
April 29, 2024

Great experience overall with Pet Door Products. They came out quickly to get me a quote, and once the glass was in stock they came out promptly to install it. The end result is beautiful, my dog loves the ability to go out on his own and I love that I can lock my sliding door again!

Holly Smith
April 29, 2024

We’ve been needing a dog door for awhile. Pet Door products made getting a door super easy. Everyone was so nice. The install was fast and the door arrived before expected. We tried another company before Pet Door Products and we did not have a good experience. Nobody followed up and they didn’t come back when they were suppose to. But Pet door products was the exact opposite. Fast, friendly, professional and a great product. My dog is enjoying the door and I am glad I don’t have to get up anymore to let her out. Win win for all! Holly Smith

Reilly Kelly-bloxham
April 29, 2024

Pat was great to work with and explained how everything would get installed. Pricing was extremely fair and the install only took about 35 min. 10/10 recommend if you’re on the fence about getting one.

Charisse Olsen
April 26, 2024

So far I've been very happy with my experience. I called Pet Door Products and in less than 24 hours had an appointment and meeting with their Representative Patrick. The process has been quick and easy and very informative I would highly recommend the company.

Nick Birdzell
April 25, 2024

Great service from Patrick. Quick responses great customer service

Kaelin Griffiths
March 28, 2024

Quick and simple, I recommend! My dogs figured it out quick. It’s been so nice to have, especially during bad weather when I’m not home, knowing the dogs can come in and out as they need.

Kody Mayo
March 28, 2024

We love it. Much better than cutting a hole in the side of my home. It looks great, fits perfectly and is great quality.

Dylan Harding
March 28, 2024

Got a door installed a few months ago and it was a breeze! Patrick is such a great guy and met all my dog door needs!

Tom Caswell
March 28, 2024

Patrick and his team were always on time and professional. They did an excellent job with top quality materials for about half the price of the other quote I got. Highly recommended!