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endura flap quick panel 3 in white comes with a locking cover
brushed aluminum patio panel insert quick panel 3
bronze very dark brown sliding glass door insert quick panel endura flap
mikey the border collie puppy going through an endura flap quick panel 3 patio panel sliding glass door pet door insert
adjustable step over for the sliding glass door inserts
parts for adjusting height of stepover for the patio panel quick panel 3

Endura Flap Quick Panel 3

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The Quick Panel 3 is a 'Lite" Version of the Thermo-Panel 3e: Identical but uses single pane glass to save weight & cost.

  • The perfect choice for temporary or seasonal installation
  • No tools required for installation and no permanent changes to your sliding glass door
  • Lighter patio panel than the Thermo-Panel 3e model and an ideal choice if the panel needs to be‚ installed and uninstalled‚ frequently
  • Safe and energy-efficient flap for pets to use

Size Chart

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

Height Options

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

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



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

Popular Features

  • Insulating flap with a complete magnetic seal, the bellows on the flap will contract and expand based on weather conditions and will resist winds up to 50mph
  • Fits into most sliding glass doors, including vinyl and aluminum frames, with a track width of at least 1" between the track heights of 75"- 80" and tall sliding glass doors between 93 ¼" - 96 ¼". Custom track heights are available upon request
  • Sturdy locking cover that can be placed over the pet door to keep pets in or out as well as provide extra security to your home.
  • Adjustable step-over allows you to customize the height between the pet door and the bottom of the panel. This allows you to accommodate pets with long legs (such as a Great Dane). Usually, a shorter step-over is preferred
  • Includes a C-Clamp lock to secure your dog door panel  against your sliding glass door.
  • Four sizes are available to accommodate cats to large breed dogs
  • 100% designed, engineered, and manufactured in the USA
  • 90-day return policy and a 15-year warranty

The award-winning‚ Endura Flap‚ Pet Door for Sliding Glass Doors - Quick Panel 3‚ - is identical to the‚ Thermo Panel 3e‚ except for the use of heavy-duty single pane glass instead of dual-pane, low‚ 'E' glass. It is appropriate for more temperate climates or where a lighter weight panel is desired.

Important Information about Custom Heights

Custom height patio panels are essential in two situations. First, 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 where 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". 

Remember that 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".

There are limits to the heights that we can manufacture, which result from the height of the flap assembly, which is fixed, and 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 #6 35" 100"
Medium #8 42" 107"
Large #10 48" 117"
Extra Large #12 46" 123"


Custom orders cannot be resold. Therefore, they must be a 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).

Replacement Parts and Accessories


Endura Flap‚ Dog Doors‚ 


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


Installing a Patio Pacific Panel Pet Door

Variable Magnetic Resistance


Adjusting the Step Over Height‚ 


The Leaf Blower Test‚ 

Endura Flap® Pet Door Warranty

To the original purchaser, Endura Flap® Pet Doors 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.

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 Endura Flap® Pet Doors together with proof of purchase, will be repaired or replaced and returned to the customer free of charge.

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