Endura Flap Panel Height and Sash Width Extensions Flap Size:Small The plastic frame is 3"

The plastic frame is 3" thick on both sides

Patio Panel comes in three height ranges to accommodate common sliding glass door sizes

you can semi-permanently install by screwing L-brackets into the panel/height extension and sliding glass door track for stability)

Flaps are easy to clean with soap and water or non-harsh cleaners

Magnets along three sides of the flap for improved wind resistance

Endura Flap Panel Height and Sash Width Extensions Flap Size:Small The plastic frame is 3"Extension for Endura Flap Thermo Panels & Thermo Sashes and Dragon Panels & Sashes with aluminum frames (will not work with vinyl framed pet door) Part of the anti whoops design feature on all Thermo panels and sashes Gives you an extra 3 4" added to the panel or sash adjustment range Three colors and four sizes to match your pet door Thermo Panel Height and Thermo Sash Width Extensions These are a part of the exclusive anti whoops feature on all