Security Boss MaxSeal Replacement Flaps


Security Boss MaxSeal Replacement Flaps

MaxSeal flaps are specific to size as well as their location of interior or exterior on your pet door. A interior flap will not line up correctly with the magnets of the exterior frame and vice versa. The magnet placement of both the interior and exterior of your pet door are designed to provide you with an optimum seal. Altering the placement of these magnet positions will affect the performance of your door.

Replacing your MaxSeal flaps is easy and can be done without removing the pet door frames. Thumbscrews located at the top of the flap can be loosened by hand or by Allen wrench (Provided in your hardware packet when you purchased the door). If you have any difficulty you can place a Flathead screwdriver behind the flap and apply some pressure to allow thumbscrews to catch.

Flap Location:

The interior and the exterior flaps are unique due to the positioning of the metal strikes on each flap. You cannot use an interior flap on the exterior side of your pet door for example. Flaps are UV protected and have embedded nylon cords that run vertically in the material. These flaps are also weatherized to prevent shrinking in sub-zero temperatures.


Custom sizing available - please contact us for more info

Size Flap Size  Rough Opening   Outside Frame Dimensions Shoulder Height Pet Width Breed Example
5" w x 7 1/2" h

8 1/8" w x 9 5/16" h

9 3/8" w x 10 9/16" h

Up to 7"

Up to 4"
Security Boss Pet Door Small Size Cat Door

Cats (only very small)

Small/ Medium 6" w x 9" h 9 1/8" w x 10 3/16" h 10 3/8" w x 12 1/16" h 9" - 13"
Up to 5"
Security Boss Pet Door Small/Medium Door Size

Most Cats, Chihuahua, Dachshund, Mini Poodle

Medium 9" w x 12" h 11 1/8" w x 13 13/16" h 12 3/8" w x 15 1/16" h 12" - 15"
Up to 8"
Security Boss Pet Door Medium Size Dog Door

Terriers, Pug, Corgi, Shiba Inu

Large 11" w x 16" h 13 1/8" w x 17 3/16" h 14 3/8" w x 19 1/16" h 15" - 20"
Up to 10"
Security Boss Pet Door Large Size Dog Door

Basset, Chow, Keeshond, Husky

Tall 11" w x 20" h 13 1/8" w x 21 13/16" h 14 3/8" w x 2 1/16" h 21" - 24"
Up to 10"
Security Boss Pet Door Tall Large Size Dog Door

German Shepherd, Labrador Retriever

Tall Grand 11" w x 25" h 13 1/8" w x 26 3/16" h 14 1/16" w x 26 9/16" h 25" - 27"
Up to 10"
Security Boss Pet Door Tall Grande Dog Door

Standard Poodle, Irish Setter, Greyhound

XL Grand 12" w x 24" h 14 1/8" w x 25 13/16" h 15 3/8" w x 27 1/16" h 25" - 31"
Up to 11"
Security Boss Pet Door XL Grand Size Dog Door

Afghan, Irish Wolfhound, Borzoi

Wide Tall 15" w x 20" h 17 1/8" w x 21 13/16" h 18 3/8" w x 23 1/16" h 22" - 24"
Up to 14"
Security Boss Pet Door Extra Wide Tall Size Dog Door

Rottweiler, Akita, Bulldog

Mammoth 15" w x 24" h 17 1/8" w x 25 13/16" h 18 3/8" w x 27 1/16" h 25" - 27"
Up to 14"
Security Boss Pet Door Mammoth Size dog door

St. Bernard, Newfoundland

Behemoth 15 3/4" w x 32" h 17 7/8" w x 33 13/16" h 19 1/8" w x 35 1/16" h 25" - 31"
Up to 14"
Security Boss Pet Door Behemeth Size Dog Door

Great Dane, Mastiff, Great Pyrenees

    Security Boss Doors ship from Wisconsin via FedEx Ground

    • Items normally ship in 1-3 business days from date of order, however custom or larger orders can take longer
    • Use the map below to estimate shipping transit time to your location

       Security Boss Pet Doors transit and shipping map

      Fast Shipping

      We do our best to ship FAST and make it easy for you.  At the top of this page, we have noted how long it normally takes to process and ship your order.  You can then use the map above to estimate delivery times.  We will send you an email confirmation with the tracking number as soon as your order ships

      Please see our Shipping Policy for full details.

      Easy Returns

      Things don't always work out, we get it.  We'll do our very best to make your return simple and easy.  Please email us and we'll provide all the return instructions for your specific item and an RMA number (required).

      Please see our Return Policy for full details.

      Customer Reviews

      Based on 1 review
      Jeffery Tanner (Winter Haven, US)

      Works great