Your Pet Deserves The Best And So Does Your Home! Premium Duraflex Pet Doors Give You The Highest Quality, Toughest, Best Sealed Pet Doors On Earth! Patented Duraflex Heavy Duty Doors Are 100% Air Tight And Withstand Winds Up To 50 Mph! These Doors Use Patented Technology With Rare Earth Magnets Embedded Along The Entire Periphery Of Our Unique Wide Flange Flap.

Mating Magnets In The Frame Are Mounted On Floating Seals To Perfectly Mate With The Flap To Providing A Draft Free Seal At All Points. No Draft, No Air Leaks Ever! The Large Size Flap Measures 10. 1/2 X 21 To Accommodate Most Dogs Up To 90 Lbs. Installs Easily In Any Door 7/8 To 1 1/8 Thick.