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Endura Flap Single Flap Door Mount Pet Door

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  • Best energy-efficient pet door for extreme cold or hot weather
  • Single or double flap options available to suit you and your pet door needs
  • Durable aluminum frame
  • Complete magnetic seal to resist winds up to 50mph
  • Strong and sturdy Locking Cover included to secure your home and pet
  • Installs into doors 1/2" to 1 3/4" thick
Great for Moderate Climates Great for Moderate Climates
Home-Improvement Must Home-Improvement Must
Moderate Installation Difficulty Moderate Installation Difficulty

Size Chart

Flap Size Flap Dimension Rough Cut Out Outside Frame Dimension Flap Type
Small 6" w x 11" h 8 5/8" w x 15" h 9 7/16" w x 16" h Single
Medium 8" w x 15" h 10 5/8" w x 19 1/8" h 11 1/2" w x 20" h Single
Large 10" w x 19" h 12 5/8" w x 23 1/16" h 13 9/16" w x 24" Single
Extra Large 12" w x 23" h 14 11/16" w x 27 1/8" 15 5/8" w x 28" h Single

Single Flap or Double Flap? This page is the single flap version. See the double flap door mount version. Double flaps would provide more insulation for your home, perfect for climates that experience extreme hot or cold weather. If you live in a more temperate climate the single flap would be enough.

Parts List

Single Flap Door Mounts

1 flap frame

1 trim frame

locking cover

4 - 1 3/4"screws

4 - 2 1/4" screws

1 - installation template

8 - hole plugs

2 - weather strips (already installed in frame)

1 - installation instruction booklet

Popular Features

  • High-quality polyolefin flap with a complete magnetic seal for unbeatable insulation value and weather resistance 
  • Extreme weather resistance for maximum insulation value 
  • Installs in all types of doors including, but not limited to, solid core doors, hollow core doors, metal doors, storm doors  
  • Secure Locking Cover with the strength of 1/16" of steel to prevent unwanted guests from entering though your doggie door
  • Four flap sizes available from small for cats to extra large for big dogs to accommodate most breeds
  • Add or decrease magnet strength, perfect for training pets or increasing wind resistance
  • Manufactured in the U.S. 

Need help installing? Read our Dog Door for Doors Installation Guide.

Note: Endura Flap pet doors are not recommended for use by kittens or very small dogs. Cats have been successful using the Small #06; however, a few have found the Medium #08 difficult to use. We would not recommend using the Large #10 or Extra Large #12 or any of the double flap versions for cats. 

Replacement Parts and Accessories


Can I install this door into my glass door?

No, this dog door cannot be installed into single or double pane glass. However, if you have a sliding door, you can get the Thermo Panel 3e, which has the same flap installed into a door insert.

What makes this door so great?

There has been lots of discussion as to why the Endura Flap doggy door is such a‚ high performing pet door, but for engineers, pet supplies enthusiasts, or those looking for some more technical information, here is a 74-page‚ dog door energy efficiency study‚ showing what makes it so special.

Endura Flap Dog Door for Doors Installation Video

Variable Magnetic Resistance

Leaf Blower Test

Installation Instructions

Parts List

  • 1 flap frame
  • 1 trim frame
  • 4x 1-3/4 inch screws
  • 4x 2-1/4 inch screws

Tools Required

  • Pencil
  • Drill with
  • 3/8 inch drill bit
  • Level
  • Jigsaw or reciprocating saw
  • Phillips head screwdriver
  • Please read the instructions thoroughly before beginning installation.



Step 1: Tape the provided template to the door. The top edge of the cut-out line should be 1-1/4 inch (or more) above the dog's withers (shoulders) for the single flap door mount, and 2 inches for the double flap door mount. Be careful not to unduly reduce the strength of the door by cutting too close to the bottom of the door.

Step 2: Mark the hole centers for the four holes and remove the template.

Step 3: Drill the four 3/8 inch holes.

Note Drill bit needs to be long enough to go through the interior and exterior of the door. It should be both level and straight when making the holes to ensure the two frames will align properly.

Step 4: Draw lines to connect the outsides of the holes using a straight edge as shown on the template.

Step 5: Cut along the line as shown in Figure 3.

Note Jigsaw needs to be level and straight when cutting the lines to ensure the two frames will align properly.

Step 6: Install the weather-stripping into the groove on both frames with the start /end gap at the bottom.

Step 7: If a single flap door mount, place the pet door trim frame on the outside of the door and the flap frame on the inside and skip to Step 14.

Step 8: If a double flap door mount, assemble the four-piece tunnel by first bending the screw tabs down as shown in Figure 4 in the top and bottom tunnel pieces (the two identical shorter pieces).

Note: Only bend the tabs once, bending more than once may result in the tabs breaking off.

Figure 5: Remove the four flap assembly screws

Step 9: Remove the screws in the four corners of the flap frame assembly as shown in Figure 5.

Step 10: Place the top piece on, with the bent tabs down and align the top piece so the holes in the tabs lines up with the screw holes in the flap frame and screw in as shown in Figure 6. Repeat for the bottom piece.

Step 11: Slide in the tunnel side pieces as shown in Figure 7.

Step 12: Bend the tabs down with your thumb or a screwdriver handle.

Step 13: Place the flap frame with the tunnel attached on the inside and the other flap frame outside.

Step 14: Select the 2-1/4 inch set of screws for 1-3 /4-inch doors and the shorter set for 1-3/8 inch doors. Insert these into the pet door from the inside. For doors with a thickness of less than

1-3/8 inch, see special instructions. For doors between 1-3/4 inch and 2-1/4 inch with the double flap door mount, use the 2-3 /4-inch screws.

Step 15: Start all four screws as shown in Figure 8, but do not tighten.

Step 16: Before tightening down the screws, check that the pet door is level and adjust as needed.

Step 17: Tighten the screws until the weather-stripping compresses and the pet door touches the door. Do not overtighten.

Step 18: Hammer the hole covers into the frame using the wooden end of a hammer (or similar non-metal tool).

Step 19: For double flap door mounts, apply silicone along the inside of the tunnel where it mates with the flap frames to seal your pet door from the elements. Failure to seal your pet door can lead to severe water damage.

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.

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