Endura Flap Vinyl Sliding Glass Dog Door

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  • Designed specifically for vinyl patio doors and sliding doors
  • The only no-tool needed, DIY installation for vinyl doors for tracks a minimum of 1 1/2 - 1 3/4" thick
  • Durable pet door,  designed to resist harsh weather
  • Dual-pane, Low-E glass reduces UV rays and infrared light
  • Free U.S. Shipping

The Endura Flap Vinyl Panel is the most insulating dog door on the market, designed specifically for vinyl-framed sliding glass doors. Unlike other metals, the vinyl frame fits more comfortably in the track and matches the original vinyl of your sliding glass door. It’s spring-loaded, tools-free design secures in place without making any permanent alterations, which is ideal for rentals and vacation homes. Engineered to withstand -40 degree weather and 50 mph winds, the magnets that line the flap ensure the utmost energy efficiency and keep the flap sealed during rough weather. 

Not the pet door you're looking for? Check out our full selection of pet door insert for sliding doors


  • Pet flaps range from small to extra large
  • Fits into existing 1 1/2" - 1 3/4" thick track of your vinyl door, occupying space in the door opening
  • Vinyl Panel comes in multiple adjustable track height ranges:
    • 74 3/4" - 77 3/4"
    • 77 1/4" - 80 1/4"
  • Energy-efficient design ensures that the flap stays flexible in extreme temperatures
  • Magnets withstand drafts, leaks, and heavy wind
  • Flexible door flap swings on a rod at the top to avoid cracking and flexing
  • Includes a secure locking cover
  • Adjustable step-over height designed for your pet's comfort
  • 90-day return policy and a lifetime warranty


  • Vinyl frame applies seamlessly into the track for a highly insulating fit
  • The panel can be removed at any time with the semi-permanent, spring-load design
  • No tools required to keep your sliding patio doors intact
  • Comes in white to match the interior design of the existing sliding glass door
  • Sturdy locking cover allows you to secure the door when necessary
  • Gives dogs the freedom to access the outdoors without needing you to let them out
  • Structurally sound design is built to last

Parts List

Vinyl Sliding Glass Dog Door

1 panel pet door

locking cover

1 sliding door clamp lock

1 center post weather seal draft stopper

1 foam weatherstrip

1 installation instruction booklet

Size Chart

Flap SizeFlap DimensionStep Over HeightOverall Panel WidthRecommendedPet Height*
Small 6" w x 11" h4"12 3/16"10 – 14"
Medium 8" w x 15" h4"14 3/16"10 – 18"
Large 10" w x 19" h4"16 3/16"10 – 22"
Extra Large 12" w x 23" h4"18 3/16"10 – 26"


The recommended pet width is generally 1" – 2" added to the width of the flap. 

The Endura Flap Vinyl Sliding Glass Dog Door has a fixed 4" step over, please Measure Your Pet to ensure the proper fit. 

Track Height Adjustment Range is the measurement of your door height from the lowest point of your track to the highest point. Review our Track Measuring Guide for more information. The Endura Flap Vinyl Sliding Glass Dog Door comes in two adjustable ranges:

  • Short: 74 3⁄4" – 77 3⁄4"
  • Regular: 77 1⁄4" – 80 1⁄4"


If your measured track height is near the bottom of the adjustment range then you should review A Note of Caution.


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.

Additional Information



Frame Material


Track Width Minimum

1 1/2

Flap Material

Engage Polyolefin

Flap Colors


Dual or Single Pane

Dual Pane

Warranty Period


Return Period

90 days (except for custom height ranges)

Locking Cover Material

Dimensional ABS

Your Maximum Pet Size

Cats, Large Cats, Small Dogs, Medium Dogs, Large Dogs, X-Large Dogs

Climate Suitability

Severe-4 Season

Type of Window

Sideways Sliding

House Locking Method

C-Clamp Lock

Flap Design

Insulated Flap

Can Be Installed In

Dual Pane Glass Sliding Glass Door, Vinyl-Framed Sliding Glass Door

Custom Heights Available


Sealing Value


Wind Resistance

Very High

Insulation Value

Very High

Installation Instructions



Is this the same as the Thermo Panel 3e?

This is very similar in that it has the same height ranges, flap sizes, Endura Flap door sizes, and dual pane Low-e glass. However, this one is specifically made to fit better in the wider vinyl slider tracks.

Will this fit all vinyl doors?

This will work in doors that have a recessed track at least 1 1/2" wide, with a rail in the bottom that is about the size of a pencil. The patio pet door is made with a small channel that will case over that little rail.

Does it lock?

We do include a c-clamp lock, but are in the process of a redesign which will make it capable of mating with certain types of existing sliding door locks.

Can I install it myself?

It is meant to easily be put in and removed. You just have to loosen the screws at the top, fit it into the track, and then tighten them. Then to remove it you simply loosen them again and pop it out.

If you can remove it what prevents intruders from taking it out?

The thumb screws are on the inside of the house so you can't loosen them from the outside. If you are still concerned about the security of your pet door, check out our tips on how to protect your home from a pet door invasion.

Can you lock the pet door?

It comes with a closing cover, and you slide that in on the inside of the house. It is a very secure ABS plastic material that is as strong as a 1/16" sheet of steel.

Does this insulate well?

This door has superior insulating capabilities, especially when coupled with an installed piece of weather stripping! The flap has magnets that seal all the way around, and will stay closed in wind gusts up to 50mph. The dual pane glass also compliments the insulating value of you new vinyl door. It is our #1 recommendation for extreme climates.

What does the recommended pet height mean?

That column is what we recommend be the range of pet height that would be suitable for that particular flap size. So for example if you pet is 20"tall and could fit though a 10" wide opening, then you could go with the large flap. Learn more about measuring your pet for a pet door here.

How to I measure for it?

You will want to measure from the deepest part (down past the little metal rail) in the bottom, then all the way up to the deepest part inside the top track.

Does it come in any color other than white?

No, but the you can paint the vinyl to match.

What if my track is wider than 1 1/2"?

It can still work if your track is wider, but if the channel in the bottom, top, or side measures less than that you will not be able to fit it into place properly.

Can you adjust the step over at the bottom?

This panel does not have a adjustable step over, but it is pretty low at 4" so most pets should be able to negotiate that just fine. If you aren't sure if your pet can then we recommend simulating the opening with cardboard. You can cut out the flap size you are looking at, making sure that it is 4" from the edge of the cardboard. Then see if they can get through comfortably.

Does your door have to be vinyl?

No, not as long as the track height and width meet the panel specs.

Does it come for 96" sliding doors?

At this time it is not offered in the taller height ranges, but we're working on it!

What are some breeds of dogs these will fit?

The Small would be Chihuahuas, Yorkies, and cats. The Medium would be good for Corgis, Jack Russell Terriers, and French Bulldogs. The Large would fit most Labs, Goldens, and Pit Bulls. The Extra Large would be good for most Rottweilers, hefty German Shepherds, and English Labs.

Is the flap flexible?

It is flexible, but since it is two pieces sandwiched together it is a little stiffer and heavier than the more economical vinyl flaps. While it can function as a cat door or cat flap, we generally recommend that only full grown cats use it.

Is the flap clear?

It is a little foggy, but it is see through.

Will this form condensation like the aluminum panels?

Nope! That is one of the great things about vinyl insulated pet patio doors. You won't have the condensation on the inside of the house.

How do you replace the flap?

Since this is really our door mount version of the Endura Flap installed onto our vinyl panel you would replace it much like you would one installed in a regular interior/exterior door. This means that you would drill out the hole plugs to remove the screws. Then pull off the flap assembly, switch out the flaps, and reinstall the door onto the panel. All of this can be done without removing the panel from the track. You can purchase replacement flaps for the Endura.

Is there an electronic version of this panel?

We do hope to offer that option in the future, but right now we are offering only the Endura Flap options. High Tech makes an automatic sliding glass pet door. Don't forget to check out our full selection of electronic and automatic pet doors.

How do I lock my sliding glass door when there is a pet door insert installed?

You can use a charley bar from Wedgit pet doors.

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