Endura Flap Panel Height and Sash Width Extension

- Endura Flap Panel Height and Sash Width Extension for perfect door fit
- Adds 1/2" to panel or sash adjustment range to accommodate measurement errors
- Compatible with Endura Flap, Dragon, and Whiskers & Windows aluminum panels
- Available in four sizes and three colors for ideal customization
- Easy installation with high-quality aluminum construction




Product Details
- Perfect fit solution: The Endura Flap Panel Height and Sash Width Extension provides an extra 1/2" for a precise fit in various doorways and windows
- High-quality construction: Made with durable and stable aluminum, ensuring your pet's safety and comfort while using the door
- Versatile compatibility: Works with Endura Flap, Dragon, and Whiskers & Windows brand aluminum panels for convenience and adaptability
- Customize to your needs: Choose from four sizes (small, medium, large, and extra-large) and three colors (white, bronze, and brushed aluminum) for the perfect match
- Simple installation: Hassle-free installation process, saving time and money on ordering a new door panel
- Salvage measurement mistakes: Ideal for fixing measuring errors without needing to purchase a custom height Endura Flap Sliding Glass Pet Door
- Enhanced energy efficiency: Add weather stripping to the extension piece for improved insulation and energy savings
- Trusted by satisfied customers: Described as a great solution for fixing measuring mistakes and perfect for minor measurement errors
These are a part of the exclusive anti-whoops feature included on all Endura Flap patio pet doors. If you mismeasured you might be able to salvage the situation by using the "anti-whoops" feature:
To make your panel taller than 1/2", you may create your own using a 1" thick piece of wood).
To make your panel slightly shorter, up to 3/4", you may trim the flanges that accept the height extension with a metal hacksaw or jigsaw
Find The Best Pet Door Size For My Pet

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Pet Height: inches
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Pet Width: inches
FAQ
How do I know if I need to purchase this pet door extender? The height and width extensions are made for when you purchase a Thermo Panel that is too small for your doorway. It adds about ¾” extra length to your Thermo Panel. You can also create your own with a 1” thick piece of wood, but it will not be as aesthetically pleasing. |
What do I do if the panel I purchased is too tall for my doorway? If it off by less than an inch, you may be able to saw off length from either the top or bottom of the panel to bring it to size. As long as your Thermo Panel is not a custom length, you can return it within 90 days of purchase. See your return policy for more details. |
I have an odd door height. Will this pet door extender help the Thermo Panel fit into my sliding glass doorway? Yes, it can! This is great for when your door is between door range sizes. However, if there is more than ¾” difference between the panel size and your doorway, then you should invest in a custom panel insert height. |
How do I know what size to get? You need to order the size that corresponds to the size of your pet door flap. For example, if you ordered a small Endura Flap pet door, you should order the small height extension piece. |
Will this affect my door’s insulation value? It can, but we highly recommend lining the inside of the extension piece with weather stripping to prevent any loss of energy efficiency. |
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

Installation Instructions
FAQ
How do I know if I need to purchase this pet door extender? The height and width extensions are made for when you purchase a Thermo Panel that is too small for your doorway. It adds about ¾” extra length to your Thermo Panel. You can also create your own with a 1” thick piece of wood, but it will not be as aesthetically pleasing. |
What do I do if the panel I purchased is too tall for my doorway? If it off by less than an inch, you may be able to saw off length from either the top or bottom of the panel to bring it to size. As long as your Thermo Panel is not a custom length, you can return it within 90 days of purchase. See your return policy for more details. |
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I have an odd door height. Will this pet door extender help the Thermo Panel fit into my sliding glass doorway? Yes, it can! This is great for when your door is between door range sizes. However, if there is more than ¾” difference between the panel size and your doorway, then you should invest in a custom panel insert height. |
How do I know what size to get? You need to order the size that corresponds to the size of your pet door flap. For example, if you ordered a small Endura Flap pet door, you should order the small height extension piece. |
Will this affect my door’s insulation value? It can, but we highly recommend lining the inside of the extension piece with weather stripping to prevent any loss of energy efficiency. |