Free U.S. Shipping | Lifetime Warranty

Endura Flap Quick Panel 3

Regular price
Sale price
Unit price

The Quick Panel 3 is a Lite Version of the Thermo-Panel 3e: Identical but uses single pane glass for a lighter product weight. 

  • The perfect choice for temporary or seasonal installation
  • No tools required for installation and no permanent changes to your sliding glass door
  • Adjustable heights to fit any sliding glass door with a track at least 1" thick
  • Insulating flap keeps hot and cold weather out of your home
  • Lightweight panel can be installed and removed in seconds
  • Durable locking cover included to block access to the flap
Great for Temperate Climates Great for Temperate Climates
Vacation Home Must-Have Vacation Home Must-Have
Easy Installation in Minutes Easy Installation in Minutes

Size Chart

Flap Size Flap Dimension Step Over Range Overall Panel Width Recommended Pet Height
Small 6" w x 11" h 3" - 5" 11 1/4" 9" - 15"
Medium 8" w x 15" h 3" - 5" 13 1/4" 9" - 19"
Large 10" w x 19" h 3" - 5" 15 1/4" 9" - 23"
Extra Large 12" w x 23" h 3" - 7" 17 1/4" 9" - 29"


Height Options

  • Short: 74 3/4" - 77 3/4"
  • Regular: 77 1/4" - 80 1/4"
  • Tall: 93 1/4" - 96 1/4" (additional cost)

Custom heights available upon request, contact for more details and pricing.

Product Features

  • Insulating flap with a complete magnetic seal resists winds up to 50mph
  • 3/16" single pane, tempered glass is lightweight for easy installation but 50% thicker than other single pane panels 
  • Polyolefin Polymer Flap withstands extreme temperatures from -40℉ to 110℉ 
  • Fits into sliding glass doors with a track width of at least 1" 
  • Custom heights are available upon request for the perfect fit 
  • Sturdy locking cover can be placed over the pet door to block access when needed and secure your home
  • Adjustable step-over allows you to customize the height between the pet door and the bottom of the panel to accommodate all pets
  • C-Clamp lock included to secure your dog door panel against your sliding glass door 
  • Flexible flap swings on a rod at the top to avoid cracking and flexing
  • Four flap sizes available to accommodate cats to large breed dogs
  • 100% manufactured in the U.S.

Important Information about Custom Heights

Custom height patio panels are essential in two situations:

While most sliding glass door track heights are in the three standard height ranges offered, some are not. In those cases, we can build a Quick Panel 3 in a custom height to fit your specific dimension. 

The second situation is when you have a sideways sliding window.  A sliding window is essentially a miniature sliding glass door, and you can install a custom height undersize Quick Panel 3 to fit, provided the window track width is at least 1" thick. 

The Quick Panel 3 is built with a 3" spring-loaded height adjustment. When you order in one of the custom height ranges, you will be prompted for your track height. The patio panel will be built to a height that is approximately in the middle of this 3" range. For example, if you specify 40", your panel will be built to adjust from about 38" to 41" tall.

There are limits to the heights that we can manufacture, which result from the height of the flap assemblywhich is fixedand limits to the packaging that can be shipped safely. Here are the height ranges that we can accommodate:

Custom Height Minimum & Maximum Heights
Model Minimum Maximum
Small  35" 100"
Medium  42" 107"
Large  48" 117"
Extra Large  46" 123"

Custom orders cannot be resold. Therefore, they are final sale once built. Note that the glass units for custom height orders take one to two weeks for delivery from the tempering plant and that we need about a week to schedule the assembly after the glass unit arrives. So, even though your custom order must be pre-paid, delivery will take 2-3 weeks depending upon your location. (Stock items are not paid for until they are shipped).

Parts List

1 Piece Panel Pet Door

2 Piece Panel Pet Door

1 panel pet door

1 top glass panel section

locking cover

locking cover

1 sliding door clamp lock

1 sliding door clamp lock

1 center post weather seal draft stopper

1 center post weather seal draft stopper

1 foam weatherstrip

1 foam weatherstrip

1 installation instruction booklet

1 installation instruction booklet

1 bottom flap section

4 hex screws

1 hex wrench

Replacement Parts and Accessories

How to Measure Your Door for a Sliding Glass Pet Door

How to Install the Endura Quick Panel 3

The Quick Panel 3 Patio Panel Pet Door

Note: Video shows the Thermo Panel 3e which is identical except for dual-pane, low 'e' glass rather than single-pane tempered glass for the Quick Panel 3


Variable Magnetic Resistance


Adjusting the Step Over Height‚ 


The Leaf Blower Test‚ 

Does this panel work with vinyl sliders?

Yes, the Endura Flap Quick Panel 3 will work for vinyl sliding glass door so long as the track is at least 1" thick. However, for a snug fit and aesthetic look in your vinyl slider track, we carry the Vinyl Sliding Glass Pet Door as well. 

How do I measure my door to get the correct height adjustment size?

Measure from the innermost part of the bottom track to the innermost top part of the track. If there is a pencil railing, include that in the measurement because the panel straddles the railing.

Does the Quick Panel 3 require tools for installation?

Endura Flap sliding glass dog doors under 80 ¼" do not require tools, making them one of the best dog doors for rental homes. Panels above this height will be shipped in two pieces and require some tools for installation. The sectionals will need to be assembled with 4 hex screws and a hex wrench, all of which are provided.

Can an intruder remove the panel from the outside?

No, the thumbscrews are on the inside of the panel, so once installed, the Endura Flap Panel can't be removed without first loosening the thumbscrews from inside the home.

Is this door good in a cold winter climate? I want something effective in our winter months.

Yes, the Endura Flap has been tested at -40°F and it withstands winds up to 50mph.

What Is the Step-Over?

The step-over is the part of the panel under the actual flap opening. Depending on the flap size purchased, the step-over can range from 3" to 7", so you can adjust it to any step-over within that range. 

How thick is the panel? 

The Quick Panel is 1" thick. 

What locking mechanism can I use for the Quick Panel 3?

This door comes with a C-clamp lock. Alternatively, a wooden dowel or Charley Bar can be used for additional security. 

Will there be enough room for me to get through after the panel is installed?

The panel will take up some space in your sliding door track. See the "Overall Panel Width" column in the size chart. This gives the width of the panel, which is the amount of space that will be taken up. 

Endura Flap® Pet Door Warranty

Endura Flap products have a lifetime warranty against defects in materials and workmanship under standard regular use. Damage caused by not using the product as intended, improper installation and chewing is not covered under this warranty.

Customer Reviews

Based on 2 reviews Write a review

Lifetime Warranty
Free U.S. Shipping
100% Secure Checkout
Easy Returns