Endura Flap Cat Door for Doors

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  • Most energy-efficient cat door for doors
  • Installs in interior and exterior doors 1/2" - 1 3/4" thick
  • The environmentally friendly flap remains flexible in extreme temperatures
  • Ensures home insulation and combats severe weather
  • Available in white, tan, and black (bronze)
  • Free U.S. Shipping

Cat doors that insulate well and remain sealed in extreme weather are often hard to come by. With the Endura Flap® kitty door, you won't have to worry about energy loss or natural elements seeping into your home. Unlike other common cat doors, Endura doors are lined with magnets on three sides of the dual-walled flap for a secure, weather-tight fit and airtight seal, making them the best cat door option for maximum energy efficiency. Engineered to withstand 50 mph winds and temperatures as low as -40°F, the Endura Flap® is a solid, weatherproof cat door that keeps your home at a comfortable temperature without compromising your feline's freedom to come and go.


  • Designed with a heavy-duty aluminum frame for longevity and durability.
  • Frame color comes in white, black (bronze), or tan.
  • Self-frames to all doors 1/2" to 1 3/4" thick. Adjusting the single flap to less than 1 3/8" requires cutting the trim frame with a jigsaw.
  • 6" x 11" flap is taller and narrower to accommodate both small and large cats.
  • The environmentally friendly, polyolefin-polymer flap remains flexible in temperatures as low as -40 degrees Fahrenheit/ degrees Celsius and resists sun warping.
  • This Insulated cat door stays sealed in winds up to 50 mph for optimal insulation.
  • Adjustable magnets line all 3 sides of the flap for a tight seal. To adjust the magnet strength for easier training, refer to the Videos section for a short tutorial.
  • The flap swings on a rod to prevent wearing or breakage at the top of the frame.
  • High-quality ABS plastic locking cover included for security.
  • Designed and engineered in the U.S. 


  • Reliable and insulating 4 season cat door
  • Sleek frame design and color options are made to complement your home
  • The flexible flap is easy to clean
  • Ability to keep cats inside or outside with the locking cover
  • Cats have the freedom to come and go as they please

Size Chart

Flap Size & Stock No Flap Dimension Rough Cut Out Outside Frame Dimension Flap Type
Small 03PP06 6" w x 11" h 8 5/8" w x 15" h 9 7/16" w x 16" h Single

Additional Information

Flap Material

Engage Polyolefin

Your Maximum Pet Size


Climate Suitability

Severe-4 Season

Ability to Lock Flap

Separate Locking Cover-Loads from Top

Sealing Value

Very High

Wind Resistance

Very High

Installation Instructions


  • Flap frame
  • Trim frame
  • Four 1 ¾" (4.4 cm) screws
  • Installation template
  • Eight hole plugs
  • Four 2 ¼" (5.7 cm) screws



  • Pencil
  • Drill with 3/8" (9.5 cm) drill bit
  • Level
  • Jigsaw or reciprocating saw
  • Phillips head screwdriver
  • Measuring tape


Please Note: Please thoroughly read the instructions before beginning installation.



Step 1: If possible, remove the door from its hinges, using a screwdriver and hammer to tap out the hinge pins. Lay the door on a flat surface for installation. Tape the provided template to the door. Be careful not to cut too close to the bottom of the door, as you may jeopardize the door’s structural integrity. Level the top edge of the cut-out line.

Step 2: Once you are certain the pet door will work with your door, drill through the holes marked on the template with a ⅜" (9.5 mm) bit. Make sure your drill is kept level and drills all the way through the door.

Step 3: Draw lines to connect the outsides of the holes using a straight-edge and/or level. Then cut along the line with a saw. If your door is less than 1 ⅜" (3.5 cm) thick, see the special instructions under DOORS LESS THAN 1 ⅜" (3.5 cm) THICK.

Step 4: Ensure the weather stripping is firmly pressed in the groove on both frames.

Step 5: Place the trim frame on the outside of the door and the flap frame on the inside.

Step 6: Select the appropriate screws (see below) and insert them into the pet door from the inside. Do not fully tighten the screws until all four are inserted and the pet door is leveled.

  • 1 ¾" (4.4 cm) screws for doors 1 ⅜" (3.5 cm) thick
  • 2 ¼" (5.7 cm) screws for doors 1 ¾" (4.4 cm) thick


Step 7: Once the pet door is leveled, tighten the screws so that the weather stripping compresses and the frames touch the door. Do not over tighten.

Step 8: Use the wooden end of a hammer, rubber mallet, or other non-metal tool to tap in the hole plugs. You can also place a wood block on the hole plug and tap the block with a hammer.



If your door is less than 1 ⅜" (3.5 cm) thick, the trim frame needs to be cut down so that the door mount can fit into the door.

Step 1: Remove the foam weather stripping before taking the frame apart. Set aside. Remove the four screws from the trim frame. Pull apart the trim frame. Do not remove the plastic corners attached to the ends of the trim frame pieces.

Step 2: If your door is 1" - 1 ⅜" (2.5 cm - 3.5 cm) thick, cut all four trim frame pieces at the first line about ⅜" (9.5 mm) from the edge.

If your door is ½" - 1” (1.3 cm - 2.5 cm) thick, cut all four trim frame pieces at the line about ¾" (1.9 cm) from the edge.

Be sure to support the trim frame (a block of wood a couple inches shorter than the piece you are cutting is a good choice) so that it does not sit on the plastic corners attached to the ends while cutting.

Step 3: Reassemble the trim frame. If necessary, cut the screws from the packet used in Step 6 (above) down to a ½" (1.3 cm) longer than your door thickness to secure the pet door. When cutting screws, thread on a nut so that once you’re finished, removing the nut will realign the threads of the screw.

Replace the weather stripping when you are finished. Make sure the piece stops and ends at the bottom of the frame.



The best way to install the pet door is by straddling the recessed area of one of the panels. Set the pet door on the flat area in the middle, side, and below the recessed panel. The frame will cross the recessed area on the top, so you will be left with a gap. The easiest way to fill this gap is to buy battens or shims from a local hardware store, and cut them to fit. 

When that gap is mostly filled, caulk the remaining areas to seal the pet door to the surface of the door in which you are installing it. If the space is very irregular you can also use squishy, foam weather stripping, which will compress down for a tight fit. When finished, use caulking to seal the door.




Can I install this into a wall or window?

If you want a wall entry pet door for cats, it might be best to invest in the Endura Flap Dog Door for Walls, but the flap might be too heavy for your cat to lift. Instead of a door installation, you might want to consider a cat door for windows instead, such as the Thermo Sash 3e Cat Doors for Sash Windows.

Does this door have a lockable flap?

You can lock this door with it's ABS plastic locking cover. The Ideal Pet Products Cat Flap Door comes with a 4-way lock while Petsafe, Cat Mate, and Sureflap sell electronic cat doors that lock and unlock when it detects either a collar key attachment or your cat's microchip.

Can my dog use this door?

Some pet owners report that their small dogs can share a cat door with their cats as long as it has a large enough door size. However, since this door has a taller and narrow flap design than most doggy doors, it may be best to invest in a separate pet door for your dog.

Can I use this as an interior cat door to separate my cat litter box from the rest of the house?

While this door was made into your patio door, there is no reason why it can't be installed indoors.

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