A note on single versus double flap versions: We think that the single flap version is adequate for all but the most demanding climate situations. The double flap versions and the #10 and #12 single flap versions are not recommended for cats.

Features:

* New! Extreme Performance 'Endura' flap - The best pet door flap ever made. Tired of replacing worn out, leaking flaps? You owe it to yourself to investigate the Endura Flap. See the full story here. It seals, it insulates and it will last forever!

* New! 'High Aspect Ratio' design: Much easier to fit your pet. Improves security for medium to large sized pets. Easier to share with a smaller pet.

* New! User-adjustable magnet strength: Optional Magnet kits allow the customer to increase wind resistance or reduce magnet pull for training. Each kit will contain 2 magnets (top and bottom) plus installation clip and instructions.

* Beefy aluminum framing with completely hidden hardware. No more flimsy frames with bolts showing all over.

* New! 'Green' flap material: Safe for the environment unlike vinyl (PVC) which is not.

* Self-Framing using heavy gauge aluminum tunnel for all walls to 8" thick (ample for most 2x4 & 2x6 stud walls).

* Sturdy Locking Cover - Locks pets in or out. Easy to use clip lock is better than the old spring-loaded pin locks.

* Four sizes - From #6 for cats and small dogs to the #12 for very big dogs.

* 100% Designed, Engineered and Manufactured in the USA.